Which effect is produced by calcitriol, the active form of vitamin D?
Correct answer: A. Increased intestinal calcium absorption
- A. Increased intestinal calcium absorption
- B. Reduced intestinal calcium absorption
- C. Increased urinary calcium loss
- D. Reduced calcium movement into bone
Explanation
Calcitriol increases intestinal absorption of calcium and phosphate, supporting bone mineralisation. Reduced calcium absorption or increased urinary loss would tend to lower, rather than support, blood calcium.
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About Endocrine System
The endocrine system covers hormone-producing glands including the pituitary, thyroid, parathyroids, adrenals, pancreas, pineal gland, ovaries and testes. It explains hormone classes, target-cell responses, feedback control, and the functions of hormones such as insulin, thyroxine, cortisol, growth hormone and ADH, which is often confused with a kidney-produced substance.
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40 free Endocrine System MCQs from Anatomy and Physiology for Nursing, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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