Here is a possible chat between the hypothalamus and the pineal gland before sleep:
Hypothalamus: Hey pineal gland, it's getting dark outside. Time to start producing melatonin.Pineal gland: Sure thing, hypothalamus. I'll get right on it.Hypothalamus: Thanks, pineal gland. I'm going to go take a nap now.Pineal gland: Good night, hypothalamus. Sleep well.How does the endocrine system work for sleep?The hormone that the hypothalamus produces that sends signals to the pineal gland to produce melatonin is called melatonin-releasing hormone (MSH). The hypothalamus and the pineal gland work together to regulate sleep-wake cycle.
When it gets dark outside, the hypothalamus releases MSH, which signals the pineal gland to start producing melatonin. Melatonin is a hormone that makes the body feel sleepy. It helps to regulate the body's internal clock and to promote sleep.
Find out more on endocrine system here: https://brainly.com/question/4455660
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What is a smell?
A)electrical signals from the substance you are smelling
B)light from the substance you are smelling
C)molecules of the substance you are smelling
D)smells are not matter, but are energy waves from the substance you are smelling