(1) Pressure of the baby's head against the cervix stimulates an increasing level of oxytocin secretion, which strengthens and increases the rate of uterine contractions until birth of the baby. (a) cervix; oxytocin (b) cervix; relaxin (c) body of the uterus; oxytocin (d) placenta; estrogen (2) Prostaglandins in semen stimulate wave-like contractions of the uterus and uterine tubes. (a) testosterone (b) bicarbonate ions (c) Prostaglandins (d) sperm
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