During childbirth, as a baby's head is pressed against the mother's cervix, signals are relayed via nerves from cervix to the mother's brain. The brain initiates the secretion of oxytocin (a hormone) from the mother's pituitary gland. Oxytocin stimulates further uterine contractions. As the uterus contracts even harder in response to oxytocin, the baby's head is pushed harder against the cervix; this stimulates yet more nerve signals to the mother's brain, resulting in yet more oxytocin secretion until finally the baby is pushed through the cervix. The integrating center in this process of childbirth is
A. the mother's pituitary gland.
B. oxytocin.
C. the mother's brain.
D. the mother's cervix.
E. the nerve signals to the mother's brain.
Answer: C
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