Answer: Progesterone.
- A Progesterone
- B Adrenaline
- C Thyroxine
- D Insulin
Correct answer: A. Progesterone
Explanation: Progesterone, mainly from the corpus luteum, prepares and maintains the uterine lining for pregnancy.
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.