Questions: QUESTION 15 A person just ate a bag of salty chips causing blood sodium ( Na+ ) levels to rise. What must the body do to return to homeostasis? release a hormone (aldosterone) which causes the kidneys to retain sodium release a hormone (ANF) which causes the kidneys to excrete sodium no change to the blood sodium levels

QUESTION 15 A person just ate a bag of salty chips causing blood sodium ( Na+ ) levels to rise. What must the body do to return to homeostasis? release a hormone (aldosterone) which causes the kidneys to retain sodium release a hormone (ANF) which causes the kidneys to excrete sodium no change to the blood sodium levels
Transcript text: QUESTION 15 A person just ate a bag of salty chips causing blood sodium ( Na+ ) levels to rise. What must the body do to return to homeostasis? release a hormone (aldosterone) which causes the kidneys to retain sodium release a hormone (ANF) which causes the kidneys to excrete sodium no change to the blood sodium levels
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Solution

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The answer is the second one: release a hormone (ANF) which causes the kidneys to excrete sodium.

Explanation for each option:

  1. Release a hormone (aldosterone) which causes the kidneys to retain sodium: This option is incorrect. Aldosterone is a hormone that increases the reabsorption of sodium by the kidneys, which would raise blood sodium levels further, not lower them.

  2. Release a hormone (ANF) which causes the kidneys to excrete sodium: This option is correct. Atrial natriuretic factor (ANF), also known as atrial natriuretic peptide (ANP), is a hormone released by the heart in response to high blood volume and high sodium levels. It promotes the excretion of sodium by the kidneys, which helps to lower blood sodium levels and return the body to homeostasis.

  3. No change to the blood sodium levels: This option is incorrect. The body must regulate blood sodium levels to maintain homeostasis. Allowing high sodium levels to persist without any regulatory response could lead to health issues such as hypertension.

Summary: To return to homeostasis after consuming a bag of salty chips, the body releases a hormone (ANF) which causes the kidneys to excrete sodium.

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