Which phase of labor involves the uterus rising upward as the placenta descends into the vagina?

• A. First stage of labor
• B. Third stage of labor
• C. Second stage of labor
• D. Fourth stage of labor

Answer: (B)

The third stage of labor is characterized by the delivery of the placenta following the birth of the baby. During this stage, after the baby is expelled, the uterus continues to contract, facilitating the separation and descent of the placenta into the vagina. As the placenta moves downward, the fundus of the uterus may rise upward and become elevated in the abdomen. This is due to the quick contraction of the uterus as it shrinks in size and helps to prevent excessive bleeding.

In contrast, the first stage of labor is focused on cervical dilation, the second stage on the delivery of the baby, and the fourth stage involves the immediate postpartum period where maternal recovery is monitored. None of these stages specifically denote the process of the placenta descending into the vagina with the uterus rising upward like the third stage does. Thus, the description aligns perfectly with the physiological changes occurring during the third stage of labor.