Bone growth depends on a supply of calcium in the blood and bone also serves as a reservoir for stored calcium.What is responsible for maintaining a constant level of calcium in the blood?
A) a derivative of vitamin D.
B) parathyroid hormone.
C) calcitonin.
D) all of the choices are involved in regulating blood calcium levels.
E) none of the choices are correct.
Correct Answer:
Verified
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