Final answer:
Vitamin D increases the absorption of calcium from the intestines, helping to maintain normal serum concentrations of calcium and phosphate. It promotes the synthesis of calcium binding protein, which facilitates the active transport of calcium across the intestinal mucosa. Vitamin D also plays a crucial role in bone health, muscle contraction, hormone secretion, and neurotransmitter release.
Step-by-step explanation:
Vitamin D increases the absorption of calcium from the intestines, helping to maintain normal serum concentrations of calcium and phosphate. It promotes the synthesis of calcium binding protein, which facilitates the active transport of calcium across the intestinal mucosa. Vitamin D also plays a crucial role in bone health, muscle contraction, hormone secretion, and neurotransmitter release.