ISSA Nutritionist Practice Exam

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Study for the ISSA Nutritionist Exam with our comprehensive quiz. Featuring multiple choice questions, hints, and detailed explanations, you'll prepare effectively for your certification!

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What hormone helps the body retain sodium and as a result increases blood volume?

Cortisol
Insulin
Aldosterone
Thyroxine

The correct answer is: Aldosterone

Aldosterone is the hormone responsible for regulating sodium retention in the body, which leads to an increase in blood volume. It is produced by the adrenal glands and plays a crucial role in the renal system by acting on the kidneys to promote the reabsorption of sodium from urine back into the bloodstream. This reabsorption of sodium draws water along with it, thereby increasing the overall blood volume. Cortisol, while having various functions including the regulation of blood sugar and the body's response to stress, does not primarily focus on sodium retention. Insulin, on the other hand, is primarily involved in glucose metabolism and does not directly influence sodium levels. Thyroxine is a thyroid hormone that regulates metabolism but does not have a significant role in sodium retention or blood volume modulation. Each of these hormones has distinct functions, but it is aldosterone that specifically facilitates sodium retention and, as a result, increases blood volume.