Q: What is the activity of Atrial Natriuretic peptide (ANP)?  

Answer: D

Atrial natriuretic peptide (ANP) is a hormone secreted by the heart's atria. ANP helps regulate blood pressure and electrolyte balance. ANP has multiple actions that lead to an overall decrease in blood volume and blood pressure. ANP causes vasodilation, which reduces peripheral resistance, and inhibits the secretion of aldosterone and ADH, which are hormones that promote water and sodium retention. ANP also decreases the reabsorption of sodium and water in the renal tubules, which increases their excretion in the urine. Thus, ANP activity leads to an overall decrease in blood volume and blood pressure.

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