Hormone that initiates ejection of milk, stimulates milk production and growth of ovarian follicles are ______,______and ______. A. PRL, OT and LH B. OT, PRL and FSH C. LH, PRL and FSH D. PRH, OT and LH
Hint: Hormones are chemical messengers of the body. They are secreted by the endocrine glands. These hormones play an important role during the time of pregnancy.
Complete step by step answer: Hormones play the role of intercellular messengers. They are non-nutrient chemicals. The anterior part of the pituitary gland produces growth hormone (GH), prolactin (PRL), thyroid-stimulating hormone (TSH), adrenocorticotropic hormone (ACTH), luteinising hormone (LH), and follicle-stimulating hormone (FSH). The contraction of the uterine muscles is carried out by oxytocin. It also promotes the contraction of the myoepithelial cells of the lactating breast, squeezing milk into the large ducts. Oxytocin is also known as the birth hormone or milk ejecting hormone because it is secreted in large amounts before and during labour and also during breastfeeding. Prolactin or the hormone of maternity activates the growth of the breasts during pregnancy. It also stimulates the secretion of mammary glands after childbirth. Prolactin is also known as a luteotropic hormone because of its role in stimulating the corpus luteum of the ovary to produce progesterone. Follicle-stimulating hormone is a type of gonadotropic hormone. The growth of ovarian follicles is stimulated by it. It helps in the secretion of oestrogens in females. Hence, the correct answer is option B.
Note: Some important points to remember: i. Prolactin and oxytocin target the cells of mammary glands. ii. Follicle-stimulating hormones target the cells of gonads. iii. Excessive secretion of prolactin can cause the production of breast milk even in nonpregnant women. It may also be indicative of the fact that tumours may be present in the pituitary gland.