Which one of the following hormones is NOT involved in the process of parturition in human?

Step-by-step solution

Parturition is induced by a complex neuroendocrine mechanism involving cortisol, estrogens, and oxytocin. The signals for parturition originate from the fully developed fetus and the placenta. The fetal pituitary secretes ACTH, which stimulates the fetal adrenal glands to secrete corticosteroids (cortisol). Corticosteroids cross the placenta and alter the estrogen to progesterone ratio, increasing prostaglandin synthesis and stimulating uterine contractions. The mild uterine contractions (fetal ejection reflex) tri