Normally, serum calcium level is maintained by:
1. Folic acid and thyroxine.
2. Vitamin C and prolactin.
3. Vitamin B12 and aldosterone.
4. Vitamin D and parathyroid hormone.
Correct Answer: 4
Rationale 1: Folic acid is important for DNA synthesis and RBC formation, and thyroxine is responsible for cellular metabolism.
Rationale 2: Vitamin C builds and helps maintain connective tissue, and prolactin is responsible for milk production.
Rationale 3: Vitamin B12 is important for RBC formation and protection of the central nervous system. Aldosterone causes sodium and water retention and potassium excretion.
Rationale 4: Vitamin D and parathyroid hormone increase gastrointestinal absorption of calcium and decrease calcium excretion through the kidneys. These agents also increase bone resorption, which also increases calcium levels.
Global Rationale: Vitamin D and parathyroid hormone increase gastrointestinal absorption of calcium and decrease calcium excretion through the kidneys. These agents also increase bone resorption, which also increases calcium levels. Folic acid is important for DNA synthesis and RBC formation, and thyroxine is responsible for cellular metabolism. Vitamin C builds and helps maintain connective tissue, and prolactin is responsible for milk production. Vitamin B12 is important for RBC formation and protection of the central nervous system. Aldosterone causes sodium and water retention and potassium excretion.
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