MCAT Biology Question 62: Answer and Explanation
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Question: 62
2. Which of the following hormones directly stimulates a target tissue that is NOT an endocrine organ?
- A. ACTH
- B. TSH
- C. LH
- D. GH
Correct Answer: D
Explanation:
A hormone that directly stimulates a non-endocrine target tissue is referred to as a direct hormone. Glancing at the answer choices, we notice that all of the hormones are secreted by the anterior pituitary gland. The direct hormones secreted by the anterior pituitary are prolactin, endorphins, and growth hormone (GH). All of the other answer choices are tropic hormones; the tropic hormones of the anterior pituitary include follicle-stimulating hormone (FSH), luteinizing hormone (LH), adrenocorticotropic hormone (ACTH), and thyroid-stimulating hormone (TSH).