Answer: Thymosin.
- A Insulin
- B Melatonin
- C Thymosin
- D Glucagon
Correct answer: C. Thymosin
Explanation: The thymus secretes thymosins, which promote the maturation of T-lymphocytes.
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.