Question

Mammotrophs are cells in the anterior pituitary that produce prolactin (PRL). They release PRL in response to thyrotropin-releasing hormone and are inhibited by dopamine. Other regulators include estrogen and progesterone. PRL stimulates lactation by the mammary gland.

What stimulates lactation by the mammary gland?
a) Prolactin (PRL)
b) Thyrotropin-releasing hormone
c) Dopamine
d) Estrogen

Answer 1

Prolactin (PRL), a hormone produced by the anterior pituitary gland, stimulates lactation in the mammary glands.

Step-by-step explanation:

The hormone that stimulates lactation by the mammary gland is prolactin (PRL). This non-steroid endocrine hormone is secreted by the anterior pituitary gland and is instrumental in the production of milk following childbirth.

The regulation of prolactin levels involves prolactin-releasing hormone (PRH) which stimulates prolactin release, and prolactin-inhibiting hormone (PIH), also known as dopamine, which inhibits it.

In addition, estrogen and progesterone, as well as the suckling action of a baby, contribute to prolactin regulation and milk production through a positive feedback loop.