Which stage of labor involves the separation of the placenta from the uterine wall?

The stage of labor that involves the separation of the placenta from the uterine wall is the placental stage. This stage occurs after the birth of the baby and is critical for ensuring the complete delivery of all components associated with childbirth. During this phase, the uterine muscles continue to contract, helping to detach the placenta from the inner wall of the uterus. Following its separation, the placenta is expelled through the birth canal.

The other stages listed typically refer to different phases of the labor process: contraction refers to the tightening of the uterine muscles, expulsion refers to the delivery of the baby itself, and transition is the phase where the cervix dilates from about 8 to 10 centimeters, often characterized by intense contractions and significant changes in the mother's behavior and emotional state. Each stage has distinct characteristics and functions, but only the placental stage specifically addresses the detachment and delivery of the placenta.