ENDOCRINE SYSTEM
ENDOCRINE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Blood calcium plays a role in the processes of blood clot formation, muscle contraction and signal conduction in neurons. Negative feedback mechanisms regulate the release of the paired hormones that maintain the blood calcium levels. Which of the following statements correctly describes this regulatory process?
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The pituitary gland releases calcium ions when blood calcium levels fall below the set point.
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Calcitonin, released by the parathyroid gland, stimulates the deposition of calcium from bones into the blood stream when blood calcium levels are high.
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Thyroxine, secreted by the thyroid gland, stimulates the release of calcium from the parathyroid gland when blood calcium levels fall below the set point.
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Parathyroid glands release PTH which stimulates the release of calcium from bones when the blood calcium levels are lower than the set point.
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Explanation:
Detailed explanation-1: -The parathyroid hormone (PTH), secreted by the parathyroid glands, is responsible for regulating blood calcium levels; it is released whenever blood calcium levels are low. PTH increases blood calcium levels by stimulating osteoclasts, which break down bone to release calcium into the blood stream.
Detailed explanation-2: -Calcium homeostasis is maintained by actions of hormones that regulate calcium transport in the gut, kidneys, and bone. The 3 primary hormones are parathyroid hormone (PTH) 1, 25-dihydroxyvitamin D-3 (Vitamin D3), and calcitonin.
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