Asked by Void<3
This diagram shows a feedback loop in the human body that helps maintain homeostasis. Which of the following is the most likely function of this feedback loop?
(1 point)
Responses
regulation of calcium levels in the blood
regulation of calcium levels in the blood
conversion of calcium to PTH
conversion of calcium to PTH
storage of calcium in the kidney
storage of calcium in the kidney
breakdown of calcium in the small intestine
All Answers 1
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regulation of calcium levels in the blood
Explanation: Parathyroid hormone (PTH) and related responses form a negative feedback loop that keeps blood Ca2+ within a narrow range (PTH raises blood Ca2+ by stimulating bone resorption, increasing renal reabsorption and activating vitamin D to boost intestinal absorption). The other choices misstate the physiology (calcium is not “converted to PTH,” kidneys don’t store calcium, and calcium is absorbed rather than “broken down” in the intestine).
Explanation: Parathyroid hormone (PTH) and related responses form a negative feedback loop that keeps blood Ca2+ within a narrow range (PTH raises blood Ca2+ by stimulating bone resorption, increasing renal reabsorption and activating vitamin D to boost intestinal absorption). The other choices misstate the physiology (calcium is not “converted to PTH,” kidneys don’t store calcium, and calcium is absorbed rather than “broken down” in the intestine).
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