Question

Which hormone stimulates the expulsion of milk during feeding of baby?

• A. Oxytocin
• B. Relaxin
• C. Prolactin
• D. Progesterone

Answer 1

Answer: (A)

Oxytocin

A. Oxytocin stimulates a vigorous contraction of uterine muscles during childbirth and initiates ejection of milk from the mammary glands and it is synthesised by the hypothalamus and is transported axonally to neurohypophysis of the pituitary gland.

B. Relaxin causes relaxation of pelvic ligaments and cervix during childbirth and secreted by corpus luteum at the end of pregnancy.

C. Prolactin regulates the growth of mammary glands and milk production in them. It activates the growth of breasts during pregnancy and is secreted by adenohypophysis of the pituitary gland.

D. Progesterone stimulates uterine lining for embryo implantation to maintain pregnancy and is secreted by the ovary.

So, the correct answer is 'oxytocin'.