MCAT Biology Question 64: Answer and Explanation

Home > MCAT Test > MCAT biology practice tests

Test Information

Question: 64

4. Which of the following statements concerning growth hormone is NOT true?

  • A. Overproduction of growth hormone in adults results in acromegaly.
  • B. It promotes growth of bone and muscle.
  • C. It is produced by the hypothalamus but secreted by the pituitary.
  • D. A childhood deficiency in growth hormone results in dwarfism.

Correct Answer: C

Explanation:

Growth hormone is a direct hormone secreted by the anterior pituitary. Among its many functions, GH promotes growth in bone and muscle, eliminating choice (B). An overproduction of growth hormone in children results in gigantism, whereas in adults it results in acromegaly (enlargement of the small bones in the extremities and of certain facial bones, such as the jaw), eliminating choice (A). On the other hand, a childhood deficiency of growth hormone results in dwarfism, eliminating choice (D). GH is synthesized and secreted in the anterior pituitary; choice (C) describes antidiuretic hormone and oxytocin, not GH.

Previous       Next