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The whole thing! Labor is a series of contractions that cause the upper part of the uterus (fundus) to tighten and thicken which works to push the baby down and out - while the cervix and lower portion of the uterus stretch and relax, giving the baby a passage from inside the uterus and into the birth canal for delivery.
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Earn +20 ptsQ: Which uterine wall layer contracts during childbirth?
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