Labor begins when the increasing concentration of ________, which stimulate(s) uterine contractions, reaches a point that overrides the effect of _________, which inhibit(s) uterine contractions.

Question

Quizplus · Accepted Answer

Estrogens stimulate uterine contractions, while progesterone inhibits them. As labor begins, the concentration of estrogens increases and progesterone decreases, leading to the onset of contractions. Relaxin also plays a role in labor by softening and relaxing the cervix, but it does not directly stimulate uterine contractions.

Labor Begins When the Increasing Concentration of ________, Which Stimulate(s)