Which hormone regulates exchange of calcium between bones and blood and increases blood calcium?

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Multiple Choice

Which hormone regulates exchange of calcium between bones and blood and increases blood calcium?

Exchange of calcium between bones and blood is regulated by parathyroid hormone. When blood calcium is low, the parathyroid glands release this hormone, which raises calcium levels by stimulating bone resorption to release calcium, increasing calcium reabsorption in the kidneys, and promoting activation of vitamin D to boost intestinal calcium absorption. This combination lifts blood calcium and maintains it within a normal range, with a negative feedback loop reducing the hormone as calcium normalizes. Other options don’t fit as well: calcitonin lowers blood calcium, while insulin mainly controls glucose and thyroxine affects metabolism and bone turnover but does not directly raise blood calcium.

Exchange of calcium between bones and blood is regulated by parathyroid hormone. When blood calcium is low, the parathyroid glands release this hormone, which raises calcium levels by stimulating bone resorption to release calcium, increasing calcium reabsorption in the kidneys, and promoting activation of vitamin D to boost intestinal calcium absorption. This combination lifts blood calcium and maintains it within a normal range, with a negative feedback loop reducing the hormone as calcium normalizes. Other options don’t fit as well: calcitonin lowers blood calcium, while insulin mainly controls glucose and thyroxine affects metabolism and bone turnover but does not directly raise blood calcium.

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