Answer: Pancreas (beta cells).
- A Liver
- B Pancreas (beta cells)
- C Adrenal gland
- D Pituitary gland
Correct answer: B. Pancreas (beta cells)
Explanation: Insulin is produced by beta cells of the Islets of Langerhans in the pancreas. It lowers blood glucose levels.
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.