Which Factor Does NOT Contribute to Parturition

Which factor does NOT contribute to parturition?

A) The 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.

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