Question

Select the correct matching of a hormone, its source and function.

	Hormone	Source	Function
(a)	Vasopressin	Posterior pituitary	Increases loss of water through urine
(b)	Norepinephrine	Adrenal medulla	Increases heart beat, the rate of respiration and alertness
(c)	Glucagon	Beta cells of islets of Langerhans	Stimulates glycogenolysis
(d)	Prolactin	Posterior pituitary	Regulates growth of mammary glands and milk formation in females

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (B)

b

Norepinephrine is released from the adrenal medulla into the blood as a hormone and is also a neurotransmitter in the central nervous system and sympathetic nervous system. Norepinephrine is responsible for the fight-or-flight response, along with epinephrine, directly increasing heart rate, triggering the release of glucose from energy stores, and increasing blood flow to skeletal muscle. It increases the brain's oxygen supply. As a stress hormone, norepinephrine affects parts of the brain, such as the amygdala, where attention and responses are controlled.