Question

a. what is the effect of calcitonin? 1) decreases amount of free calcium in the bloodstream 2) decreases activity of osteoclasts which allows osteoblasts to out - pace osteoclasts 3) causes calcium to be deposited in the bone. 4) all of these choices are correct.

Explanation:

Calcitonin is a hormone that lowers blood - calcium levels. It decreases the activity of osteoclasts (cells that break down bone and release calcium into the blood), allowing osteoblasts (cells that build bone) to out - pace them. This leads to a decrease in the amount of free calcium in the bloodstream and causes calcium to be deposited in the bone.

Answer:

All of these choices are correct.