Question

Hormone stimulating milk secretion is
Prolactin
Luteinising hormone
Estrogen
Testosterone

Answer 1

Milk is produced in mammary glands which is a part of the reproductive system in humans. Production of milk occurs after the delivery and is mediated by hormones secreted from the pituitary gland.

Complete step by step answer: Hormones are the chemical substances that are secreted by the endocrine glands in our body. They are only produced in a small amount and are responsible for the normal metabolism in our body. We know that even a slight change in the amount of secretion may lead to severe diseases.
The hormone that stimulates milk production and secretion is prolactin that is produced in the pituitary gland. The production is mediated by releasing hormones from the hypothalamus. There are several neurons present in the hypothalamus that secrete prolactin-releasing hormones. These hormones reach the anterior pituitary through portal circulation between the hypothalamus and the anterior pituitary gland. These releasing hormones stimulate the lactotroph cells present in the anterior pituitary that leads to the production of prolactin from them. Prolactin is released to the blood circulation and reaches the mammary glands and stimulates milk production in the alveoli present in the mammary lobes. Know that prolactin also helps in mammary gland development in females.
Prolactin is also called luteotropic hormone. Milk produced in the mammary glands after the birth of the child helps in parental care in animals.
Hence the correct option is A.

Note: We know that Oxytocin released from the posterior pituitary has a role in the ejection of milk from mammary glands. It causes the contraction of the smooth muscles in the follicles present in the mammary glands and helps in milk ejection. It is also called milk ejection hormone. It is actually produced by neurosecretory cells of the hypothalamus and is stored and released by the posterior pituitary gland.