What is one of the primary functions of amniotic fluid?

One of the primary functions of amniotic fluid is to maintain a constant body temperature for the fetus. This cushioning, along with its thermal properties, helps in creating a stable environment, protecting the fetus from temperature fluctuations that could occur in the external environment. It serves as a thermal insulator, ensuring that the developing fetus is enveloped in a temperature-controlled setting, which is crucial for its growth and development.

While the other options highlight important aspects of the pregnancy environment, they do not accurately reflect the primary functions of amniotic fluid. For instance, while amniotic fluid does provide some protective benefits that may support fetal movement, it is not primarily responsible for facilitating maternal contractions, nor does it provide nutrition directly, as the fetus receives nourishment through the placenta. The movement facilitated by amniotic fluid, though beneficial, primarily serves to allow the fetus to develop muscle tone and coordination rather than being a main function of the fluid itself.