Question

16 osteoclasts are
a cells that break down bone matrix.
b immature bone cells that give rise to osteocytes.
c cells that secrete bone matrix.
d mature bone cells that maintain the matrix.

Explanation:

Osteoclasts are multinucleated cells derived from the monocyte/macrophage lineage. Their main function is bone resorption, which involves breaking down the bone matrix.

• Option B describes osteoblasts (not osteoclasts) as immature bone cells that can differentiate into osteocytes.
• Option C is incorrect because osteoblasts are the cells that secrete the bone matrix.
• Option D refers to osteocytes, which are mature bone cells that maintain the bone matrix.

Answer:

A. cells that break down bone matrix.