What does the umbilical cord connect during pregnancy?

The umbilical cord serves as a critical lifeline during pregnancy, connecting the mother and the fetus. It facilitates the exchange of nutrients, gases, and wastes between the mother and the developing fetus, ensuring that the fetus receives the necessary sustenance for growth and development. Through this connection, oxygen-rich blood from the mother is transported to the fetus, and carbon dioxide and other waste products are carried away from the fetus back to the mother for elimination.

In contrast, the other options highlight different aspects of pregnancy but do not accurately represent the direct function of the umbilical cord. For instance, while the umbilical cord is indeed associated with the placenta, its primary role is the connection between the mother and the fetus rather than just connecting to the placenta itself. The amniotic sac provides a protective environment for the fetus but is not directly connected by the umbilical cord. Similarly, the uterus and cervix are involved in pregnancy and labor processes but are not connected through the umbilical cord.