Too Much Calcium in the Bloodstream,a Condition Called Hypercalcemia,can Be

Too much calcium in the bloodstream,a condition called hypercalcemia,can be very dangerous.The thyroid gland releases a hormone called calcitonin when calcium is too high.What must calcitonin do to lower calcium levels in the blood?

A) It reduces osteoclast activity and increases osteoblast activity.
B) It increases osteoclast activity and reduces osteoblast activity.
C) It reduces both osteoclast and osteoblast activity.
D) It increases both osteoclast and osteoblast activity.

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