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The Role of Oxytocin in Childbirth Process

Learn how progesterone receptor blocking and oxytocin production lead to labor contractions, illustrating positive feedback in birth process.

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The Role of Oxytocin in Childbirth Process

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  1. Birth • Towards the end of pregnancy progesterone receptors are blocked so progesterone is no longer effective • As a result, the pituitary gland will produce the hormone oxytocin • Stretching of the lower uterus walls by the fetus will add to the stimulus for the pituitary to secrete oxytocin • Oxytocin causes the smooth muscles in the uterine wall to contract (Labor) • The fact that oxytocin causes the uterine walls to be stretched which in turns stimulates the production of even more oxytocin is an example of positive feedback

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