During the delivery of a baby the baby’s head is pushing against the cervix causing the cervix wall to stretch

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2022-09-16

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During the delivery of a baby the baby’s head is pushing against the cervix

causing the cervix wall to stretch. This stretching causes nerve impulses to be

sent to the hypothalamus which directs the posterior pituitary to release oxytocin

in the blood. Oxytocin stimulates the uterus to contract which pushes the

baby’s head deeper into the cervix, stretching it further. This situation is a

description of which of the following?

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2022-09-16

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B: The stimulus (cervical stretching) causes the integrating centre

(the hypothalamus) to respond by enhancing the stimulus – releasing oxytocin

so that the uterus contracts. Enhancing the stimulus is an example of positive

feedback. The feedback stops when the cervix is no longer being stretched, that

is when the baby is delivered.

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