Which of these factors does NOT contribute to parturition
A)Increasing ACTH (adrenocorticotropic hormone) secretion by the fetal pituitary causes the fetal adrenal glands to secrete more cortisol, which diffuses into the maternal circulation.
B)Cortisol increases oxytocin and progesterone secretion, increasing plasma progesterone levels.
C)The uterus stretches as the pregnancy progresses, initiating nerve impulses that stimulate oxytocin secretion from the posterior pituitary lobe.
D)The number of oxytocin receptors on uterine muscle fibres increases, causing the uterus to become more sensitive to the effects of oxytocin.

Question

Quizplus · Accepted Answer

Increasing plasma progesterone levels would actually inhibit parturition, as progesterone maintains the uterine lining and inhibits contractions. Therefore, cortisol would actually decrease plasma progesterone levels to promote parturition.

Which of These Factors Does NOT Contribute to Parturition