You have just finished a really long workout at the gym. You are sweating quite a bit and feel thirsty. You have lost a lot of water and some ions while sweating. In response to decreased Na+ in body fluids (Na+ depletion), your kidneys will renin secretion. decrease increase stop

increase

Explanation:

As water and ions are lost through exercise, overall blood volume can decrease. To maintain adequate blood volume and blood pressure, renin is secreted to help in the conversion of angiotensin I to angiotensin II. This will cause vessels to constrict and sodium and water to be retained by the kidneys.

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