Parathyroid hormone functions to increase calcium ion levels in blood. If its secretion is regulated through negative feedback, under which conditions would this hormone normally be released?
A) Parathyroid hormone secretion occurs when blood calcium levels are too low.
B) Parathyroid hormone secretion occurs when blood calcium levels are too high.
C) Parathyroid secretion is constant to maintain blood calcium levels.
D) Parathyroid hormone secretion increases in the morning and decreases in the afternoon.
Correct Answer:
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