BIO NMDCAT Human skeleton

nmdcat.online July 27, 2026

During growth, a child’s long bones increase in diameter mainly due to the activity of:

A. Chondrocytes of epiphyseal plate

B. Osteoblasts beneath the periosteum

✓

C. Osteoclasts in the medullary cavity

D. Osteocytes within lacunae

📝 Explanation

Correct: Osteoblasts beneath the periosteum deposit new bone on the outer surface, increasing bone thickness. A: Chondrocytes increase bone length. C: Osteoclasts resorb bone. D: Osteocytes mainly maintain bone tissue. Concept: Appositional growth of bone.

📖 Additional Information

Chondrocytes of epiphyseal plate
Osteoblasts beneath the periosteum
Osteoclasts in the medullary cavity
Osteocytes within lacunae

Correct: Osteoblasts beneath the periosteum deposit new bone on the outer surface, increasing bone thickness. A: Chondrocytes increase bone length. C: Osteoclasts resorb bone. D: Osteocytes mainly maintain bone tissue. Concept: Appositional growth of bone.

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