Which is not active in bone resorption?

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Which is not active in bone resorption?
A . osteoblasts
B . osteoclasts
C . nephrons
D . small intestine

Answer: A

Explanation:

Bone resorption, the decomposition of bone for absorption of minerals, including calcium, directly involves osteoclasts. Nephrons and the small intestine both absorb released Ca2+. Osteoblasts function to construct, not decompose, bones.