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PSIO 202, Lecture 11

Angiotensin also controls aldosterone secretion when

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Unformatted text preview: one Aldosterone. Angiotensin also controls aldosterone secretion. When AT II levels are increased, aldosterone is secreted by the adrenal cortex, which increases salt and water reabsorption in an effort to raise blood pressure, by raising blood volume. Chemicals That Decrease Blood Pressure Atrial natiuretic peptide-reduces blood pressure Histamine-reduces blood pressure Hormonal control of blood pressureAtrial natriuretic peptide Atrial natriuretic peptide (ANP) is released by cells of the atria when blood pressure is high. This hormone causes vasodilation and promotes loss of water and salt by the kidneys. These two effects reduce blood volume and vasoconstriction, and act to lower blood pressure Hormonal control of blood pressure-Histamine Histamine is released by mast cells, and it can cause vasodilation by relaxing blood vessel s...
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