Question

Which hormone stimulates the expulsion of milk during the feeding of a baby?
(a) Oxytocin
(b) Relaxin
(c) Prolactin
(d) Progesterone

Answer 1

Hint: Hormone is the chemical messengers that are secreted directly into the blood and carry out the blood to two organs and tissues and exert their functions. It occurs due to the lack of pregnancy hormones.

Complete answer:
Oxytocin hormone stimulates the expulsion of milk during the feeding of a baby. It is a peptide hormone and is produced in the hypothalamus which is released by the posterior pituitary. It helps with reproduction and the period after childbirth. It gets released with the response to love and labour. It helps in the stimulation of the uterine muscles during childbirth. It initiates the ejection of milk through mammary glands.
Relaxin: It causes the relaxation of the ligaments present in the pelvic region and cervix during childbirth. It is secreted through the corpus luteum at the termination of pregnancy.
Prolactin: Prolactin is secreted by the adenohypophysis in mammals. The adenohypophysis is also known as the anterior pituitary and it causes the breast to grow and make milk during pregnancy and after birth. The prolactin is also known as luteotropic and is a protein that is present in humans. The hormone prolactin enables mammalian females to produce milk.
Progesterone: It helps with the maintenance of the endometrium and deals with pregnancy. Asteroid hormone is related to the embryogenesis of humans and other species and belongs to certain groups of steroid hormones known as progesterone which constitutes a variety of important functions in the body. It helps as the metabolic intermediate for the production of endogenous steroids that includes corticosteroids and sex hormones. It acts as a potent agonist in the nuclear progesterone receptor which results in the effectiveness of the ribosomal transcription that plays an important role in the regulation of female reproduction.

So, the correct answer is 'Oxytocin'.

Note:
The hormone mammalian prolactin is secreted by the anterior pituitary and it helps in the assessment of fertility concerns or amenorrhea. The level of prolactin increases throughout the pregnancy and remains high and just after childbirth. Prolactin is present in small amounts in men and non-pregnant women.