Section 2: human development before birth

This increase in tension and contractions tears the placenta from the uterine wall and pushes it out of the uterus, through the cervix, and out of the birth canal. Placental expulsion, also called the afterbirth, usually occurs within the first hour after delivery.

The Placental Stage. ... This increase in tension and contractions tears the placenta from the uterine wall and pushes it out of the uterus, through the cervix, and out of the birth canal. Placental expulsion, also called the afterbirth, usually occurs within the first hour after delivery.

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answer; hydrologic cycle;