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- Childbirth is an example of a positive feedback system.
- The first labor contractions act as the stimulus.
- Contractions push the fetus into the cervix.
- Stretch receptors in the cervix detect the change.
- Increased stretching sends more nerve impulses to the brain.
- The brain acts as the control center.
- The brain signals the pituitary gland.
- The pituitary gland releases the hormone oxytocin into the blood.
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