What function does amniotic fluid NOT serve for the fetus?

Amniotic fluid plays several crucial roles in the development and well-being of the fetus during pregnancy. However, it does not function as a blood supply for fetal tissues. Instead, the fetus receives its blood supply through the placenta, which is responsible for nutrient exchange, oxygenation, and waste removal.

In contrast, the other functions of amniotic fluid are well-established. It helps regulate the temperature within the amniotic sac, providing a stable environment that protects the fetus from extreme temperature changes. It also cushions the fetus, offering protection against physical trauma, and enables movement, which is essential for normal musculoskeletal development. This fluid allows the fetus to exercise its muscles and joints, promoting healthy growth and development. Therefore, the correct answer clearly indicates that the function of providing blood supply is not one of the roles amniotic fluid serves during fetal development.