question: What type of fluid cushions the fetus and helps protect it from injury?
distractor3: aqueous
distractor1: plasmid
distractor2: epithelial
correct_answer: amniotic
support: Another structure that supports the fetus is the amniotic sac. This is a membrane that surrounds and protects the fetus. It contains amniotic fluid, which consists of water and dissolved substances. The fluid allows the fetus to move freely until it grows to fill most of the available space. The fluid also cushions the fetus and helps protect it from injury.