The level of testosterone in the blood is increased by
A)a high level of testosterone stimulating the hypothalamus.
B)the hypothalamus stimulating the testes to release LH.
C)LH causing the interstitial cells to release testosterone.
D)a high level of testosterone stimulating the testes to release more LH.

Question

Quizplus · Accepted Answer

LH (luteinizing hormone) causes the interstitial cells of the testes to release testosterone. Therefore, an increase in testosterone in the blood is due to LH causing the interstitial cells to release more testosterone. Options A and D are incorrect because high levels of testosterone do not stimulate the hypothalamus or the testes to release more LH. Option B is incorrect because the testes do not stimulate the hypothalamus; rather, it is the other way around.

The Level of Testosterone in the Blood Is Increased by