What Is An Amniotic Sac?
Answer:
During the gestation period the baby lives in the amniotic sac, which is a tough, shiny, transparent membrane. It keep full of fluid, but this is by no means stagnant. More than a third of its volume is removed and replaced every hour. This amounts to a total daily exchange equivalent to six gallons! In about the third month the infant begins to practice inhaling and exhaling exercises. Breathing in the amniotic fluid may help within formation of its lung sacs. The baby does not drown, because its blood gets oxygen from the mother through the placenta's commotion. Also, the baby swallows much of this fluid, from which it apparently gets some nourishment.
The amniotic sac renders another fine service to the child. It provides the baby with an even temperature within its temporary "home." Moreover, the baby is almost weightless contained by its liquid surroundings and is therefore free to kick, to move more or less and even to turn somersaults, all this strengthening its muscles for when it enters the world of atmosphere and will have to move more or less without the liquid support.
The amniotic sac is the sac in which the fetus develops.
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