A vitamin D deficiency in children can possibly cause what?

Question

BlackTom AI · Accepted Answer

Vitamin D deficiency in children leads to impaired calcium and phosphate homeostasis and defective mineralization of growing bone, producing rickets.

1) Relevant knowledge points and concepts
- Vitamin D (converted to 25‑OH and active 1,25‑(OH)2 vitamin D, calcitriol) increases intestinal absorption of calcium and phosphate.  
- Adequate Ca and PO4 are required to mineralize osteoid at growth plates.  
- In children, failure of mineralization at the growth plate causes rickets; in adults, similar deficiency causes osteomalacia.  
- Typical laboratory pattern: low 25‑OH vitamin D, low Ca and/or PO4, elevated parathyroid hormone, and raised alkaline phosphatase.

2) Step‑by‑step reasoning process
- Step 1: Vitamin D deficiency → reduced intestinal Ca and PO4 absorption.  
- Step 2: Reduced serum Ca stimulates secondary hyperparathyroidism → increased bone resorption and renal phosphate wasting.  
- Step 3: Low phosphate and inadequate calcium in the growth plate prevent normal mineralization of newly formed osteoid.  
- Step 4: Impaired mineralization at growth plates leads to widened, irregular epiphyses and soft, deformed bones — clinically seen as rickets (e.g., bowed legs, frontal bossing, rachitic rosary, delayed growth).

3) Calculations
- No numerical calculations are required for this conceptual diagnosis; the argument is mechanistic and biochemical.

4) Why the correct answer is correct
- The pathophysiology described above directly produces the skeletal deformities and growth‑plate lesions defined as rickets; therefore vitamin D deficiency in children can cause rickets.

5) Why the other options are incorrect
- b. Hemolytic anemia: more commonly linked to oxidative stress (e.g., G6PD deficiency) or severe vitamin E deficiency, not vitamin D.  
- c. Xerophthalmia and d. Night blindness: both are manifestations of vitamin A deficiency (xerosis, Bitot spots, nyctalopia), not vitamin D deficiency.

6) Conclusion
- The correct answer is a. Rickets, which matches the provided answer.

A vitamin D deficiency in children can possibly cause what?单项选择题

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