MCAT Biology Question 63: Answer and Explanation
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Question: 63
3. Increased synthetic activity of the parathyroid glands would lead to:
- A. an increase in renal calcium reabsorption.
- B. a decrease in the rate of bone resorption.
- C. a decrease in basal metabolic rate.
- D. a decrease in blood glucose concentration.
Correct Answer: A
Explanation:
The parathyroid glands secrete parathyroid hormone (PTH), a hormone that functions to increase blood calcium levels. An increase in synthetic activity of the parathyroid glands would lead to an increase in PTH and, therefore, an increase in blood calcium levels through three mechanisms: increased calcium reabsorption in the kidneys (decreased excretion), increased bone resorption, and increased absorption of calcium from the gut (via activation of vitamin D).