Considering the definition of density, you obtain that:
Part A: the density of gold is 19.3 g/cm³.Part B: the density of iron is 7.8 g/cm³.Definition of densityDensity is defined as the property that allows to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
It can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Density in this caseIn this case, you know that:
A sample of gold has mass of 38.6 grams and a volume of 2 cm³.A sample of iron has a mass of 46.8 grams and a volume of 6 cm³.Replacing in the definition of density:
Gold: density= 38.6 g÷ 2 cm³Iron: density= 46.8 g÷ 6 cm³Solving:
Gold: density= 19.3 g/cm³Iron: density= 7.8 g/cm³In summary, the density of gold is 19.3 g/cm³ and the density of iron is 7.8 g/cm³.
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The electrical impulse is __________ as it passes through the av node, which permits the atria to contract __________ ventricles
The electrical impulse is delayed as it passes through the av node, which permits the atria to contract before ventricles.
What are ventricles?
A ventricle is one of two sizable chambers at the base of the heart that gather and discharge blood to the lungs and peripheral beds of the body. An atrium, a nearby chamber in the upper heart that is smaller than a ventricle, provides the blood pumped by a ventricle. Interventricular refers to structures between the ventricles, such as the interventricular septum, whereas intraventricular refers to structures inside a single ventricle (for example an intraventricular block).
The right ventricle pumps blood into the pulmonary circulation, which travels to the lungs, and the left ventricle pumps blood into the systemic circulation, which travels through the aorta, in a four-chambered heart like the one seen in humans.
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What are the three types of interactions between organisms in an ecosystem? a. competition, mutualism, and predation b. territoriality, predation, and symbiosis c. competition, predation, and symbiosis d. commensalism, parasitism, and mutualism please select the best answer from the choices provided a b c d
Competition, predation, and symbiosis are the three types of interactions that occur between organisms in an ecosystem. Therefore option c is the correct choice.
Competition occurs when organisms are competing for the same resources. It can be between organisms of the same species (intraspecific competition) or different species (interspecific competition). The act of eating all or a portion of the body of another organism, the prey, is known as predation. A relationship or interaction between two separate organisms that live in the same habitat is referred to as symbiosis. Three different forms of behavior, known as mutualism, commensalism, and parasitism, are seen in symbiotic interactions.
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When your first child is six months old, you hang a tire swing from a tree limb in your backyard. The bottom of the tire is six inches from the ground. When your child graduates college 22 years later, the tree is now ten feet taller than it was when you hung the tire swing. Neglecting soil erosion and any increased thickness of the limb, how far from the ground is the bottom of the tire?.
(a) Six inches, approximately is how far from the ground is the bottom of the tire neglecting soil erosion and any increased thickness of the limb even if your child graduates college 22 years later and the tree is now ten feet taller than it was when you hung the tire swing.
It has the same distance since tress grow from the top. Trees develop in the opposite direction—from the top. Meristems are patches formed by specialized cells at the tips of each tree shoot, including the main leader. These meristems are the places where a tree increases its height and lengthens its limbs. The meristems would be eliminated if a tree were chopped like grass, preventing the tree from becoming higher or longer.
However, as trees grow from their distal ends, the branches that emerge from the trunk can never grow higher. A branch that grows 3 meters from the ground today will remain there the next year.
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Question correction:
When your first child is six months old, you hang a tire swing from a tree limb in your backyard. The bottom of the tire is six inches from the ground. When your child graduates college 22 years later, the tree is now ten feet taller than it was when you hung the tire swing.
a. six inches, approximately
b. ten feet, six inches
c. somewhere in between A and B
What concept explains the attitude people are to have toward their call to dominate creation?
The concept that explains the attitude people are to have toward their call to dominate creation is that Men are to exercise their stewardship. To act as responsible caretakers of the aspect of creation that God has given to them.
What is the Creation Mandate in the Bible?The Creation Mandate is known to be a term that is often called the the dominion mandate or simply the cultural mandate.
This is known to be a term that connote or tell God's words that were given to Adam and Eve in Genesis 1 telling them the way that they can be a good stewards of His creation.
Note that when we think of a mandate, we are said to think of a God's command as well as his divine blessing to man
Therefore, The concept that explains the attitude people are to have toward their call to dominate creation is that Men are to exercise their stewardship. To act as responsible caretakers of the aspect of creation that God has given to them.
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Are differences in migratory orientation within a species genetically determined?
Genetic variations account for a sizable portion of variation in migratory behaviour as well as in physiological and morphological adaptations to migration. Comparative research indicates that various lineages have separately and quickly evolved migratory behaviour.
How does migration impact a species' ability to evolve?In evolutionary time, migration will often quickly converge gene frequencies among populations. Migration is a powerful mechanism for balancing the gene frequencies of subpopulations in a species in the absence of selection. Gene frequencies will ultimately equalise if the migration rate is larger than zero.
Animals move across habitats in a pattern called migration in pursuit of food, better living conditions, or reproductive requirements.
An intrinsic activity known as migration is the long-distance seasonal travel.
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19. What are the components of a chemical reaction?
Answer:
Product and reactants
Explanation:
hope this helped you.
In the autonomic nervous system, neurotransmitter activation of its receptor terminates when the neurotransmitter is broken down by enzymes or when it diffuses away. Which other mechanism leads to termination of neurotransmitter activity?.
Other than the autonomic nervous system, active transport into surrounding cells leads to terminations of neurotransmitter activity.
The ANS is responsible for the termination of the neurotransmitter activations which are held by enzymes. The peripheral nervous system's autonomic nervous system (ANS), originally known as the vegetative nervous system (VNS), provides smooth muscle and glands, which in turn affects how internal organs work.
The autonomic nervous system is a mechanism that governs body processes including heart rate, digestion, respiration, pupillary response, urine, and sexual arousal mostly subconsciously. The fundamental mechanism in charge of the fight-or-flight response is this system. Through the brain stem, the spinal cord, and the organs, integrated reflexes control the autonomic nervous system.
Control of breathing, cardiac regulation (the cardiac control center), vasomotor activity (the vasomotor center), and other reflex acts including coughing, sneezing, swallowing, and vomiting are all examples of autonomic activities.
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6. information stored in inorganic molecules is used to direct the synthesis of cellular components.
The statement is false that information stored in inorganic molecules is used to direct the synthesis of cellular components.
Cellular components are various structures and organelles that the cell is made up of. These are the nucleus, plasma membrane, mitochondria, etc. All these components are made up of organic molecules like carbohydrates, proteins, nucleic acids, lipids, etc.
Inorganic molecules are those that do not contain the carbon atom. The inorganic components can be majorly seen in the non-living things in the environment. However, presence of inorganic molecules in the living organisms is rare. The example of inorganic molecules are: carbon monoxide, carbon dioxide, carbides, salts, etc.
The question is incomplete, the complete question is:
Information stored in inorganic molecules is used to direct the synthesis of cellular components. Is the statement true or false ?
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Gray whales (Eschrichtius robustus) gather each winter near Baja California to give birth. How might such behavior make it easier for ecologists to estimate birth and death rates for the species?
Ecologists might theoretically estimate birth rates by measuring the number of children born each year, and mortality rates by observing how the number of people fluctuates year after year.
What does a ecologist do ?Ecologists examine these interactions between species and ecosystems of all sizes, from minuscule bacteria living in a fish tank to the complex interactions between thousands of plant, animal, and other groups found in a desert. Ecologists investigate a wide range of habitats.
What is an example of mortality ?Mortality is the condition of having to die one day or the rate of failure or loss. All animals will die eventually, which is an illustration of mortality. The amount of high school pupils who do not graduate is one illustration of mortality.
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Receptor-mediated endocytosis involves the use of specific proteins in the cell membrane. true false
Receptor-mediated endocytosis involves the use of specific proteins in the cell membrane is true.
The import of iron into a mammalian cell is another instance of receptor-mediated endocytosis. In general, iron is not imported into the cell by itself, similar to how serum cholesterol is. Instead, it is bonded to the serum protein apotransferrin, which binds two Fe3+ ions.
By the inward budding of the plasma membrane, a process known as receptor-mediated endocytosis (RME), also known as clathrin-mediated endocytosis, cells can absorb metabolites, hormones, proteins, and occasionally viruses (invagination).
This process, which is solely mediated by receptors on the cell surface, creates vesicles containing the ingested chemicals. This procedure only allows chemicals that are receptor-specific to enter the cell.
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What information is needed to calibrate a molecular clock and use it to estimate the time that has passed since two species shared a common ancestor?
The gene sequences for both of the taxa plus those of several related taxa is needed to calibrate a molecular clock and use it to estimate the time that has passed since two species shared a common ancestor.
The molecular clock is a figurative time period for a way that makes use of the mutation fee of biomolecules to deduce the time in prehistory at the same time as two or extra lifestyles office work diverged. The biomolecular statistics used for such calculations are generally nucleotide sequences for DNA, RNA, or amino acid sequences for proteins.
In choice to measuring seconds, minutes and hours, says Hedges, Penn nation professor of biology, the molecular clock measures the huge style of changes, or mutations, which acquire in the gene sequences of diverse species through the years.
An ideal molecular clock has a number of capabilities fee fidelity via time, fee homogeneity throughout lineages, taxonomic breadth and applicability, and accessibility of the statistics. Characters which have superior at a exceedingly steady fee are the maximum appropriate for molecular.
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drag the correct description into each white box to show your understanding of the five is of microbiology.
The Microbiology Sector is responsible for the cultivation, isolation and identification of bacteria, fungi and yeasts that cause diseases in animals.
What is done in the microbiology laboratory?The microbiology laboratory acts to isolate the microorganisms and is designated for studies, such as for and extension. Therefore, it must contain equipment with technology, in addition to the support of essential technique for the work and quality materials.
With this information, we can conclude that equipment widely used in microbiology laboratories is the optical microscope, a device that allows professionals in the field to visualize atoms and cells that are invisible to the eye with greater clarity.
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What are some variables that weren't controlled for in this experiment that could be explored in a follow-up study?
The correct answer is Age and gender are two factors that were not taken into account in this study and may be further examined in future work.
Researchers looked at the amounts of ACTH in 20 people's bodies as they woke up from sleep. The researchers employed a short, long, and one surprise approach to establish the mean plasma ACTH level in the body.
The researchers analyzed samples from when subjects were awakened and samples taken 30 minutes later to ascertain the change in ACTH levels post-waking.
ADH enters the circulation and then travels throughout the body. Corticotropin-releasing hormone (CRH) and cortisol from the adrenal glands regulate the generation of ACTH.
Cortisol levels increase as a result of adrenocorticotropic hormone overproduction.
The researchers controlled time as one of the parameters in the experiment because the level of ACTH is determined by the individual's time of awakening. There were certain variables in the experiment, though, that were totally independent.
Age and gender were the only two that were not under control, in part because it is irrelevant what gender a person is as long as they are in good health and fall within a certain age range.
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all of the following are nutrients that provide energy (kilolcalories) except: carbohydrades, water, fats, protiens
The nutrients like carbohydrates, fats and proteins provide energy whereas water does not.
Carbohydrates are the macromolecules that are polyhydroxy ketones or aldehydes. They can be of three types: monosaccharides, disaccharides and polysaccharides. The examples of carbohydrates are: glucose, sucrose, starch, etc. They have various functions like structural or in providing energy.
Proteins are the polymers of amino acids. They are the main body-building and repair components. The amino acids are joined together using peptide bonds to form a protein. The proteins have various levels of structure. These are: primary, secondary, tertiary and quaternary. Proteins also have enzymatic functions.
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The walls of alveoli contain elastic fibers that allow the alveoli to expand and contract with each breath. If the alveoli lost their elasticity, how would that affect gas exchange in the lungs?
Some elastic and collagen fibres can be found in the alveoli. The alveoli may extend when they fill up with air during inhalation thanks to the elastic fibres.
What occurs when the alveoli become less elastic?The lungs also enlarge inside the chest cage due to the loss of elastic tissue from the walls of the damaged alveoli. Small bronchi are compressed by the enlarged lungs, which raises airflow resistance.
Reduced alveolar elastic fibres will result in less elastic rebound, but diminished alveolar attachments to the airways will result in diminished support for the small airways and increased constriction of the small airways during expiration.
The air sacs' inner walls deteriorate and tear with time, resulting in the creation of fewer, bigger air gaps as opposed to more, smaller ones.
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The production of offspring
Answer: The production of offspring is reproduction
Explanation:
When creatures reproduce, offspring is the outcome.
Decide whether the following pairs of structures more likely represents analogy or homology, and explain your reasoning:
(c) an owl's wing and a hornet's wing.
Analogous structures accomplish the same function. However, they have different embryological origin, the elements composing them are different, and individuals carrying them are not closely related. ANALOGY.
What are homologous and analogous structure?
Homologous characters are structures that have
The same basic elements. Their position in the body and the relations with adjacent structures are also the same in different organisms.They share the same embryological development.These structures might show variations between the organisms exhibiting them. Variations might be related to their function and the environment in which the organism lives. Their function is not necessarily the same in all the organisms involved.
These homologous characters are present in organisms related that share a common ancestor.
Analogous structures are those body parts of different organisms that accomplish the same function, but they are originated from different areas.
These structures do not share the same embryological origin.
According to this information, an owl's wing and a hornet's wing are analogous structures.
These species do not share a common ancestor.The structure and elements composing the wings are very different.The embryological origin of these structures is different.Both of them have the same function.This example respresents ANALOGY.
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About 60% to 80% of the volume of most living cells consists of organic compounds. True or false?.
Answer:
False
Explanation:
Cell organelles and water make up most of a living cell's volume.
Which of the following organs is incorrectly paired with its function? a. stomach-protein digestion b. large intestine-bile production c. small intestine-nutrient absorption d. pancreas-enzyme production
The correct option is (b) Large intestine-bile production
Bile production if from liver and not from large intestine.
Bile, which is created in the liver and kept in the gallbladder, is released when chyme enters the duodenum due to hormonal reactions. By emulsifying lipids, particularly triglycerides, bile facilitates their digestion. Large lipid globules are split up into a number of smaller lipid globules by a process called emulsification. In the chyme, these tiny globules are more evenly dispersed than they are in larger aggregates. Since lipids are hydrophobic molecules, they will group together to form globules in order to reduce their exposure to water. Bile salts, which include both hydrophobic and hydrophilic components, are amphipathic and are found in bile. As a result, the hydrophilic side of bile salts can interact with water on one side and lipids on the other. Bile salts do this by breaking down large lipid globules into smaller lipid globules.Learn more about the lipid digestion with the help of the given link:
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generally, the effects of parasympathetic and sympathetic innervation of the same organ are , opposing each other to produce different results.
Antagonistic effects of the same organ are observed when parasympathetic and sympathetic innervation is present in it.
The parasympathetic division and the sympathetic division are two diametrically opposed divisions of the autonomic nervous system that control homeostasis. Most of the body's organs are innervated by both the sympathetic and parasympathetic systems, which work against one another to maintain normal physiology including blood pressure, blood oxygen levels, and nutrition levels. Each scenario necessitates a different level of effort on the part of a certain organ to maintain homeostasis. Additionally, certain organs must function in order to get the body ready for potential future circumstances. The autonomic nervous system controls each and every one of these processes.
The autonomic nervous system prepares the body for stressful conditions is the sympathetic division. This mechanism is frequently referred to as "fight or flight." Among the many impacts of this system are elevated heart rate, constricted blood arteries to the skin and viscera (raising blood supply to the muscles), enlarging pupils, and reduced salivation. All of these reactions encourage surviving in a hazardous circumstance.
The parasympathetic branch of the autonomic nervous system, sometimes known as the "rest and digest" system, gets the body ready for settings that allow for rest. The parasympathetic nervous system slows heart rate, increases gastrointestinal motility, and increases salivation, among other things. By conserving nutrients, these reactions aid the body's ability to recuperate and become ready for stressful conditions.
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In 1847 , the German biologist Christian Bergmann noted that mammals and birds living at higher latitudes (farther from the equator) are on average larger and bulkier than related species found at lower latitudes. Suggest an evolutionary hypothesis to explain this observation.
Creatures that are bigger and heavier have a lower surface to volume ratio than smaller animals. As a result, larger animals lose heat more slowly than smaller ones.
Christian Bergmann Hypothesis
Bears living in warmer regions, polar bears have massive, compact bodies that provide a smaller relative surface area (relative to volume) for heat loss.
Why hunting is more suited for larger animals in cold climates?Compared to smaller animals, larger and heavier animals are more suited for hunting. It has a significant evolutionary benefit in cold climates, which are frequent at higher latitudes and where plant food is scarce. Smaller animals, on the other hand, primarily eat plant food, which is more prevalent in lower latitudes.
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Researchers observed that the crows only gather and drop the largest whelks. What are some reasons crows might favor larger whelks?
If the larger whelks are simpler to crack open, it is obvious that the crows choose the larger ones as they require fewer drops per whelk and get more energy from doing so.
When a group of crows congregates, what does it mean?People appear to equate these corvids with death and gloom since a gathering of crows is referred to as a murder. Crows, however, are highly gregarious animals, and during this time of year they frequently congregate in large groups for warmth, protection, and sometimes even amusing discussion.
Crows are typically seen as a bad omen, and in certain traditions, they represent death. They also stand in for the vast mysteries of life.
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Dna structure plays a role in eukaryotic gene expression by:_____.
Answer:
Dna structure plays a role in eukaryotic gene expression by following different ways:
Methylating areas known as cg islands to silence them. Additionally, it can stop signaling molecules from efficiently preventing gene expression.
A single of the 2 X chromosomes gets randomly and irreversibly immobilized in cells apart from egg cells very early in female embryogenesis. The term "X-inactivation/ lyonization" refers to this process. Because of X-inactivation, every body cell inside a female has one functioning replica of the X chromosome, just as in men.
The lysine sites throughout the N-terminal tail of the nucleosome that emerge from the core of histone are also acetylated as well as deacetylated by that of the procedure known as histone acetylation or we can also say deacetylation in order to regulate gene expression.
The condensin complex, amongst many other proteins, mediates chromosomal condensation, which is required to keep chromosomes from becoming intertwined throughout chromosome segregation.
All the above highlighted lines are the different ways which play important role in gene expression.
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which polymers are composed of amino acids? view available hint(s)for part a which polymers are composed of amino acids? proteins monomers carbohydrates nucleic acids
The polymers that are composed of amino acids are proteins, while nucleic acids are composed of nucleotides and carbohydrates are composed of monosaccharides.
What are proteins?Proteins can be considered biopolymers because they are composed of linear sequences of amino acids such as for example histidine, glutamic acid, arginine, etc.
In a protein, these building blocks (amino acids) are linked through peptide bonds to form polypeptide chains.
Biomolecules such as proteins, nucleic acids and carbohydrates are considered biological polymers because they are composed of linked subunits in linear order, which is required to form macromolecular structures.
In conclusion, the polymers that are composed of amino acids are proteins, while nucleic acids are composed of nucleotides and carbohydrates are composed of monosaccharides.
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Suppose a mutation caused gated sodium channels to remain inactivated longer after an action potential. How would this affect the frequency at which action potentials could be generated? Explain.
If the sodium-gated channels are inactivated, the refractory period will be longer due to a drop in maximum frequency.
What are gated sodium channels?The fast depolarization that underpins the upstroke of action potentials in neurons is caused by voltage-gated sodium channels, which are transmembrane proteins and hence essential for the transmission of nerve impulses. Voltage-gated sodium channels play a critical role in electrogenesis, and variables that reduce their activity can have a significant impact on axonal conduction. In fact, numerous distinct therapeutically beneficial medications, including local anesthetics and anticonvulsants, reduce neuronal excitability by inhibiting the activation of voltage-gated sodium channels.
Therefore, the inactivation of sodium-gated channels would result in a longer refractory period due to a drop in maximum frequency.
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How does the flow of a fluid in a closed circulatory system differ from the movement of molecules between cells and their environment with regard to distance traveled, direction traveled, and driving force?
The heart serves as a pump for the circulatory system, which is essentially a network of cylindrical arteries, veins, and capillaries.
Blood is contained inside blood vessels in a closed circulatory system and travels unidirectionally from the heart around the systemic circulatory pathway before returning to the heart.In a closed circulatory system, a muscle pump powered by ATP typically transports fluids on a scale of millimeters to meters in a single direction. Diffusion, which involves the random movement of molecules, is the mechanism by which cells exchange information with their surroundings. On a scale of 1 mm or less, molecule concentration gradients across exchange surfaces can trigger fast net diffusion.Learn more about the closed circulatory system with the help of the given link:
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Plants absorb energy from sunlight and convert it to chemical energy to make food. which characteristic of life does this behavior best illustrate?
Answer:
Photosynthesis
Explanation:
When plants absorb energy from the sun and convert it into energy to make food, this is called photosynthesis.
the large surface area in the gut directly facilitates . the large surface area in the gut directly facilitates . secretion absorption filtration temperature regulation
The large surface area in the gut directly facilitates is absorption
Why does digestion require a vast surface area?As surface area grows, so does the pace of digestion. The process that facilitates and supports the quantity of digestive enzymes provides an explanation for this. And it is one of the enzymes types whose activity is enhanced on bigger surfaces.
Microvilli, which resemble tiny hairlike structures, are abundantly present in the villi's cells. Each cell can receive more nutrients as a result of this increase in cell surface area.
The villi and microvilli enhance the surface area available for nutrient absorption in the intestinal lumen.
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What is the difference between a protein kinase and a second messenger? Can both operate in the same signal transduction pathway?
Protein kinases are enzymes; second messengers are not necessarily enzymes; Yes, they can operate in the same pathway
Protein kinase is a critical enzyme in many fundamental cellular metabolic processes. They transfer the phosphate group from ATP to the substrate, producing the phosphorylated substrate. This phosphorylation may result in substrate activation, inactivation, destruction, or protection against destruction.
Second messengers are tiny molecules that are smaller than protein kinase. Second messengers are less stable than kinases, yet they are effective enough to attach their target molecules and either activate or deactivate them. Second messengers are usually eliminated after their function, although kinases are not always.
Yes, kinases and second messengers can both function in the same signalling pathway. For example, in G Protein Coupled Receptors (GPCRs), the second messenger cAMP binds to Protein Kinase A, resulting in Protein Kinase A activation.
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Which organ system regulates blood volume by altering the amount of fluid released in urine?
The organ system regulates blood volume by altering the amount of fluid released is urinary system.
What is the urinary system?
The kidneys discharge fluid waste in the form of urine, which is produced, stored, and eliminated by the urinary system, also known as the renal system. By filtering toxins and excess water from blood, the kidneys produce urine. The bladder is filled with urine after it travels from the kidneys through two tiny tubes known as ureters. A person urinates through the urethra to expel waste when the bladder is full.
The urinary system is prone to a wide range of infections as well as other issues, such as obstructions and injury. A urologist or another medical professional with expertise in the renal system can treat them.
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