Placenta ____ occurs when the placenta is implanted in the uterine wall such that it partially or completely covers the internal os, the opening of the uterus at the cervix.

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Placenta previa occurs when the placenta is implanted low in the uterus and partially or completely covers the internal os, which can lead to bleeding during pregnancy or delivery. Placenta accreta is a condition where the placenta is attached too deeply into the uterine wall, and placenta abruption is when the placenta separates from the uterine wall prematurely. Placenta disruption is not a medical term.

Placenta ____ Occurs When the Placenta Is Implanted in the Uterine