Question

Where is atrial natriuretic hormone produced, and what effect does it have on urine production?

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Atrium natriuretic hormone\textbf{Atrium natriuretic hormone} (ANP) is secreted by cardiac muscle cells in the walls of the right atria in the heart. These cells contain volume receptors which respond to increased stretching of the atrial wall due to increased atrial blood volume. This hormone acts on the kidney to decrease sodium ions reabsorption. Water then follows the sodium ions. As a result, urine volume increases and blood volume decreases, resulting in decreases blood pressure.

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