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Amniotic fluid. The amniotic fluid is the protective liquid contained by the amniotic sac of a gravid Amniote. This fluid serves as a cushion for the growing fetus, but also serves to facilitate the exchange of nutrients, water, and biochemical products between mother and fetus. For humans, the amniotic fluid is commonly called water or waters (Latin liquor amnii)
The fluid is absorbed and continually renewed. The fetus swallows and inhales amniotic fluid and releases urine into it. Cells from various parts of the fetus's body and chemicals produced by the fetus are present in the amniotic fluid. This allows the fluid to be sampled and tested to evaluate fetal health.