Answer: Glucagon.
- A Insulin
- B Glucagon
- C Adrenaline only
- D Thyroid hormone
Correct answer: B. Glucagon
Explanation: Glucagon (from alpha cells of pancreas) raises blood glucose by stimulating glycogen breakdown in the liver.
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.