Final answer:
The membranes surrounding a fetus, such as the amniotic sac with its amniotic fluid and the amnion, provide a protective environment for fetal development. The sac allows for freedom of movement, protection from physical shocks, and aids in temperature regulation. The chorion develops into the fetal part of the placenta, ensuring nutrient and gas exchange.
Step-by-step explanation:
The general function of the membranes that surround a fetus is to provide protection and support for the developing baby. The amniotic sac and the fluid that fills it, amniotic fluid, not only cushion the fetus from physical shocks but also allow for free fetal movement which is crucial for muscle and skeletal development. Additionally, the amniotic fluid helps in maintaining a stable temperature for the fetus and provides a medium for the fetus to practice swallowing and respiratory movements.
The amnion is a transparent sac that forms around the developing embryo and along with the chorion, another membrane, plays a protective role. The chorion surrounds the amnion and eventually develops into the fetal portion of the placenta, which serves as the connection for nutrient, gas, and waste exchange between the mother and fetus.
Lastly, the development of these membranes, including the chorion, is crucial as they form protective barriers and participate in the life-sustaining functions for the embryo and fetus during pregnancy.