Parathyroid hormone's effect on blood calcium levels?

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Multiple Choice

Parathyroid hormone's effect on blood calcium levels?

Explanation:
Parathyroid hormone raises blood calcium. It does this through three coordinated actions: it stimulates bone resorption to release calcium into the bloodstream, enhances calcium reabsorption in the kidney’s distal tubule, and promotes formation of active vitamin D (calcitriol) that increases intestinal calcium absorption. The net effect is an increase in serum calcium. The other options don’t fit because PTH does not lower or leave calcium unchanged, and while the amount of calcium mobilized can vary with physiological conditions, the direction of the effect is consistently an increase.

Parathyroid hormone raises blood calcium. It does this through three coordinated actions: it stimulates bone resorption to release calcium into the bloodstream, enhances calcium reabsorption in the kidney’s distal tubule, and promotes formation of active vitamin D (calcitriol) that increases intestinal calcium absorption. The net effect is an increase in serum calcium. The other options don’t fit because PTH does not lower or leave calcium unchanged, and while the amount of calcium mobilized can vary with physiological conditions, the direction of the effect is consistently an increase.

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