Calcium levels in the blood and bone are controlled by
A) 1,25-dihydroxyvitamin D.
B) parathyroid hormone.
C) calcitonin.
D) All of the above control calcium level.
E) None of the choices are correct.

Question

Quizplus · Accepted Answer

The calcium levels in the blood and bone are controlled by all three hormones – 1,25-dihydroxyvitamin D, parathyroid hormone, and calcitonin. 1,25-dihydroxyvitamin D increases calcium absorption from the intestine, parathyroid hormone increases calcium release from the bone into the bloodstream, and calcitonin decreases blood calcium levels by inhibiting calcium release from the bone and increasing calcium excretion by the kidneys. Therefore, all three hormones are essential in regulating calcium homeostasis in the body.

Calcium Levels in the Blood and Bone Are Controlled by