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The placenta detaches from the uterine wall during labor because of hormones that are released as well as the force of contractions. If it is left inside it can cause at least two major problems:

1. The placenta being inside the uterus would prevent it from contracting as it naturally does after the baby is born. Without this contraction, the site where the placenta separates from the wall of the uterus during labor would not be able to stop bleeding (think of the contraction as applying pressure to this wound). This can lead to postpartum hemorrhage and death of the mother.

2. Assuming that the mother does not have a hemorrhage and the placenta stays inside her uterus, it would begin to decompose because it no longer has a blood supply. Think of this as like any meat: it's fine when it's on the animal, but once you take away the blood supply it begins to die. This would in turn cause an infection that, if not treated, would likely kill the mother.

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Q: Why is the placenta deadly if left in a woman when it can survive for the baby for 9mnths Why can't it just degrade on its own when it see's its not needed anymore?
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