What tissue is directly involved in regulating blood levels of calcium?

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Multiple Choice

What tissue is directly involved in regulating blood levels of calcium?

Explanation:
Calcium homeostasis depends on how much calcium is absorbed from the diet, reabsorbed by the kidneys, and released from or stored in bone. The intestinal lining is the tissue that directly regulates how much calcium enters the bloodstream, because it is the site of dietary calcium absorption, a process enhanced by vitamin D. Hormonal signals like PTH influence overall calcium availability, including intestinal absorption indirectly, but the gut is where the calcium first enters the blood. The heart, lungs, and spleen do not regulate blood calcium levels.

Calcium homeostasis depends on how much calcium is absorbed from the diet, reabsorbed by the kidneys, and released from or stored in bone. The intestinal lining is the tissue that directly regulates how much calcium enters the bloodstream, because it is the site of dietary calcium absorption, a process enhanced by vitamin D. Hormonal signals like PTH influence overall calcium availability, including intestinal absorption indirectly, but the gut is where the calcium first enters the blood. The heart, lungs, and spleen do not regulate blood calcium levels.

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