Question

Uterine contraction at the childbirth is stimulated by birth hormone
A) Prolactin
B) Progesterone
C) Adrenaline
D) Oxytocin

Answer 1

Hint: Uterine contraction is referred to as tightening and shortening of the uterus. This takes place during labor. This contraction helps the baby to descend into the birth canal.

Complete Answer:
(I) The foetus stays in the womb for nine months till it gets delivered. The delivery of a child is initiated by the contraction of the uterus.
- During labor, the uterine contraction takes place due to which the muscles in the uterus tightens and contracts. This leads to thinning and dilation of the cervix. The baby further descends down into the birth canal for delivery.
- The contraction of the uterus is regulated by the hormone Oxytocin. It is produced by the pituitary glands.

(II) Prolactin- is also known as lactogenic hormone. It helps in secretion of milk from the mammary glands. It is also produced by pituitary gland.

(III) Progesterone- it is also known as pregnancy hormone. It is the female sex hormone. It is steroidal in nature. It helps in thickening the inner lining of the uterus.

(IV) Adrenaline- It is produced by adrenal glands. It is also called the emergency hormone which helps the body in fear, fright and fight.

The correct answer is (D). Oxytocin helps in uterine contraction.

Note: Oxytocin also stimulates lactation that is production of milk from the mammary gland. It also stimulates the smooth muscle contraction in the mammary glands during suckling and maternal behaviour.