During childbirth,the hormone oxytocin causes uterine contractions.These contractions move the baby toward the birth canal (vagina),where it pushes on pressure-sensing receptors.These receptors signal the mother's hypothalamus to produce more oxytocin,which in turn increases the uterine contractions.This is an example of
A) gene regulation.
B) positive feedback.
C) a cellular-level system.
D) a computational model.
E) negative feedback.

Question

Quizplus · Accepted Answer

This is an example of positive feedback. As the baby moves towards the birth canal, it pushes on pressure-sensing receptors which signal the hypothalamus to produce more oxytocin. This increase in oxytocin then leads to stronger uterine contractions, pushing the baby further towards the birth canal, which then stimulates even more oxytocin production, resulting in a positive feedback loop.

During Childbirth,the Hormone Oxytocin Causes Uterine Contractions