A) Relaxin
B) Vasopressin
C) Oxytocin
D) Prolactin
Correct Answer: C
Solution :
Oxytocin is a neurohypophysial hormone. It is synthesised by the hypothalamus but stored in the posterior pituitary gland. Oxytocin acts or the smooth muscles of our body and stimulates their contraction. In females, it stimulated a vigorous contraction of uterus at the time of child birth and milk ejection from the mammary gland. Relaxin is a hormone produced by the ovary and the placenta. It causes the pelvic ligaments and cervix to relax during pregnancy and delivery of the baby. Vasopressin is also synthesised by hypothalamus but stored in the posterior pituitary. It mainly acts on the kidney and stimulates resorption of water and electrolytes by the distal tubules and thereby reduces loss of water through urine. It is also called as Anti-Diuretic Hormone (ADH). Prolactin is produced by the pars distalis region of pituitary (anterior pituitary). It regulates the growth of the mammary glands and formation of milk in them.
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