How does oxytocin make contractions stronger during childbirth?

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Oxytocin makes contractions stronger during childbirth by making the uterus contract. Oxytocin changes the concentration of calcium in the muscle cells of the uterus, which causes uterine contractions. The mother’s body will already be producing natural oxytocin to cause contractions, and the addition of medical oxytocin will make them stronger.

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