During childbirth, muscular contractions acting to expel the fetus from the uterus induce hormonal signals that induce even more intense contractions. This is an example of

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This is an example of positive feedback, where the initial stimulus (muscular contractions) is amplified by the response (hormonal signals inducing more intense contractions) to facilitate childbirth.

During Childbirth, Muscular Contractions Acting to Expel the Fetus from the Uterus