What is the important of amniotic cavity and the function of mammalian placenta?

These are both highly important in pregnancy and play an essential part in the development and protection of an unborn child.

• Amniotic cavity

The amniotic cavity forms around the baby and is filled with amniotic fluid which protects the baby and allows it to move around in the uterus. This fluid filled sac prevents the baby from being injured through movement and it protects it from small knocks or falls.

In addition to this, the amniotic fluid allows for a constant environment for the baby to grow; extreme heat or cold will not affect the baby as this fluid remains at a constant temperature. It also plays a massive part in the baby's breathing; enabling them to learn to breathe whilst still in the body.

The growing baby also eats the amniotic fluid; it contains all of the nutrients needed for him or her to grown and develop.

• Mammalian placenta

The placenta is an organ within the womb which is essential in the development of an unborn baby. The placenta is connected to the baby with the umbilical cord and passes nutrients and oxygen to the unborn baby and then allows for the removal of the waste products.

The placenta protects the unborn baby from most bacterial infections however, not against viruses. Dangerous substances can also be passed on to your child in the same way; drugs, nicotine and alcohol should be avoided during pregnancy for this reason.

Antibodies are also passed through the placenta from the mother to enable the baby to be born with some defenses.