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Stretching of the atrial wall releases atrial natriuretic peptide. What does that hormone then do?
AIt raises sodium reabsorption and blood volume
BIt cuts sodium reabsorption and blood volume
CIt raises renin release and blood pressure
DIt cuts water excretion and blood sodium
Answer & Solution
Correct answer: B. It cuts sodium reabsorption and blood volume
1. Cells in the atrial wall stretch when blood volume or blood pressure rises.
2. They then secrete atrial natriuretic peptide, whose job is to bring both back down.
3. It signals the kidneys to reduce sodium reabsorption, so less water is reabsorbed and blood volume falls.
4. It also inhibits renin secretion and promotes vasodilation, which lowers blood pressure further.
5. Raising renin or raising sodium reabsorption would defend a high pressure rather than relieve it.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 17 "The Endocrine System", section 17.10 Organs with Secondary Endocrine Functions_
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