Question

24. Oxytocin is a(n):

a) hormone required for ovulation.
b) hormone required for fertilization.
c) enzyme required for water balance.
d) hormone required for parturition.

Answer 1

Correct choice is (d) hormone required for parturition.

Oxytocin is a hormone produced by the hypothalamus and released by the pituitary gland. It plays a crucial role in inducing uterine contractions during childbirth (parturition) and also helps in the milk ejection reflex during breastfeeding.

Answer 2

Oxytocin is an endocrine hormone essential for stimulating contractions and dilation of the cervix during childbirth and also supports the milk ejection reflex in breastfeeding individuals. Therefore, the most appropriate correct option is A.

Step-by-step explanation:

Oxytocin is a peptide-derived endocrine hormone that is secreted by the pituitary gland and plays a crucial role during childbirth (parturition) by stimulating uterine contractions and dilation of the cervix. This hormone is responsible for the contractions during labor and is released through a positive feedback loop. As labor progresses, the fetus's head applies pressure against the cervix, which sends signals to the hypothalamus to produce more oxytocin, leading to stronger uterine contractions and further dilation of the cervix. This feedback loop continues until the birth process is complete. Beyond childbirth, oxytocin also supports the milk ejection reflex during breastfeeding.