Osteoclasts characteristically have how many nuclei?

• A. Multiple nuclei
• B. Single nucleus
• C. No nucleus
• D. Binuclear

Answer: (A)

Osteoclasts are multinucleated giant cells formed by the fusion of precursor monocytes/macrophages. This fusion gives them multiple nuclei, which provides greater transcriptional capacity to produce the acids, enzymes, and proton pumps needed to break down bone matrix during resorption. Therefore, they characteristically have several nuclei. Some osteoclasts can be binucleated, but the defining feature is multiple nuclei rather than a single nucleus or no nucleus.