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nmdcat.online July 27, 2026

A child with vitamin D deficiency develops soft and weak bones because vitamin D primarily promotes:

A. Collagen synthesis
B. Calcium absorption from the intestine
✓
C. Cartilage formation
D. Muscle contraction

📝 Explanation

Correct: Vitamin D enhances calcium absorption, essential for bone mineralization. A: Collagen synthesis is not its primary role. C: Cartilage formation is unaffected directly. D: Muscle contraction depends mainly on calcium availability, not vitamin D directly. Concept: Bone mineralization.

📖 Additional Information

  • Collagen synthesis
  • Calcium absorption from the intestine
  • Cartilage formation
  • Muscle contraction

Correct: Vitamin D enhances calcium absorption, essential for bone mineralization. A: Collagen synthesis is not its primary role. C: Cartilage formation is unaffected directly. D: Muscle contraction depends mainly on calcium availability, not vitamin D directly. Concept: Bone mineralization.

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