A 30-year-old client arrives at the community clinic complaining of difficulty sleeping. The nurse is reviewing the key that hormones have in the body with the client
Which hormone would be the best in explaining the regulation of the sleep–wake cycle? A) Melatonin
B) Erythropoietin
C) Gastrin
D) Somatostatin
A
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Melatonin is thought to participate in the maintenance of the sleep–wake cycle. In sunlight, sympathetic nerve fibers release norepinephrine, which inhibits the secretion of melatonin and results in wakefulness. In darkness, the lack of norepinephrine stimulates the secretion of melatonin, resulting in sleepiness. Erythropoietin, gastrin, and somatostatin hormones are not responsible for the client's condition. Erythropoietin is a hormone that stimulates peripheral stem cells in the bone marrow to produce red blood cells. Gastrin is a hormone that is released after eating; it causes the stomach to produce more acid. Somatostatin is a pancreatic hormone that controls the rate of nutrient absorption into the blood stream.
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