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← Human Body & HealthWhy does bone remodeling slow down significantly after prolonged immobilization in a plaster cast following a fracture?
A)Increased osteoblast differentiation occurs
B)Reduced mechanical load inhibits bone formation✓
C)Elevated calcitonin accelerates calcium deposition
D)Increased blood flow enhances nutrient delivery
💡 Explanation
Bone remodeling slows during immobilization because the reduced mechanical stress inhibits osteocytes, which normally stimulate bone formation and resorption through mechanotransduction; therefore, reduced load decreases bone turnover, rather than increased osteoblast activity or calcitonin's effects.
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