Too Much Calcium in the Bloodstream, a Condition Called hypercalcemia

question 22

Multiple Choice

Too much calcium in the bloodstream, a condition called hypercalcemia, can be very dangerous. The thyroid gland releases a hormone, calcitonin, when calcium is too high. How does calcitonin 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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