What is the amniotic sac?

The amniotic sac plays a crucial role during pregnancy as it serves as a protective structure surrounding the developing fetus. This sac contains amniotic fluid, which cushions the fetus, providing a safe environment that allows for movement and development. The fluid also helps maintain a stable temperature and protects the fetus from physical shocks and potential injury.

While other options may refer to important biological concepts, only the amniotic sac directly relates to the protective fluid environment that is essential for fetal growth and health in the womb. Understanding this is helpful for anyone studying human development or related fields, showcasing the importance of the amniotic sac in prenatal care.