Which one of the following pairs is not correctly matched? Hormone Function
A. Insulin regulation of blood glucose
B. Melatonin regulation of sleep
C. Oxytocin release of milk from mammary glands
D. Gastrin regulation of blood pressure

Correct answer: (d) D

Explanation

Gastrin regulates gastric acid (HCl) secretion, gastric motility and mucosal growth – not blood pressure – so pair D is wrong.

Insulin regulates blood glucose, melatonin regulates the sleep cycle, and oxytocin triggers milk release (let-down) from mammary glands – all correctly matched.