Question 20

Prolactin stimulates milk production in the breasts during lactation.

Prolactin is the hormone responsible for stimulating milk production in the breasts during lactation. It plays a crucial role in initiating and maintaining milk secretion in breastfeeding mothers.

A) norepinephrine

Norepinephrine is primarily involved in the body's response to stress and does not play a direct role in milk production. It is a neurotransmitter and hormone that affects blood pressure and heart rate, rather than lactation processes.

B) antidiuretic hormone

Antidiuretic hormone (ADH), also known as vasopressin, regulates water balance in the body by affecting kidney function. It does not influence milk production and is unrelated to the lactation process.

C) prolactin

Prolactin is the key hormone that stimulates the mammary glands to produce milk. It is released by the pituitary gland during pregnancy and after childbirth, ensuring that mothers can breastfeed their infants effectively.

D) oxytocin

Oxytocin plays a significant role in milk ejection (let-down) during breastfeeding, but it does not stimulate milk production itself. Its primary function is to facilitate the release of milk that has already been produced by prolactin.

Conclusion

Prolactin is unequivocally the hormone that stimulates milk production during lactation, distinguishing it from other hormones that either support breastfeeding in different ways or are unrelated to the lactation process. Norepinephrine, antidiuretic hormone, and oxytocin do not fulfill the role of initiating milk production, making prolactin the definitive answer to this question.