Answer: testosterone.
- A testosterone
- B estrogen
- C progesterone
- D insulin
Correct answer: A. testosterone
Explanation: Testosterone is the main male sex hormone, produced by the testes.
The hypothalamus releases hormones that direct the pituitary, which releases its own trophic hormone to a target gland; that gland's hormone output then feeds back (dashed lines) to suppress both the pituitary and hypothalamus once levels are sufficient - a self-correcting loop running the entire endocrine system.
Concept context
The endocrine glands, hormone classification and mechanism of action, and negative feedback regulation.