Question

what are the functions of placenta and amniotic sac

Answer 1

The term Placenta is derived from a Greek word meaning flat cake. It is defined as a special kind of tissue connection between the mother and the fetus, formed by the inner lining of uterus and the fetal membranes for the purpose of physiological exchange of materials.

Role of Placenta :

Placenta is formed by the fusion of uterine tissues and fetal membranes. It serves mainly as for the transport of nutrients and oxygen from the mother to the fetus.

It serves as a placental barrier and and also prevents the direct mixing of both maternal and fetal blood.

There are different types of classification of placenta based on the type of fetal membranes, based on the distribution of villi, based on the nature of contact and based on histology [ types of tissues].

The term Amnion is defined as the fetal membrane or an Extra embryonic membrane. The animals which developing an amnion are called Amniota. It surrounds the embryo. It is made up of two layers, namely an outer somatic mesoderm and an inner ectoderm.

It encloses a cavity or a sac known as amniotic cavity or an amniotic sac. It is filled with a fluid called amniotic fluid. The amnion is connected to the embryo on the ventral side by a stalk called somatic umblicus. Amnion ruptures at the time of birth.

Role of amniotic sac :

The embryo is freely immersed and bathed in the amniotic fluid. Hence it functions as the artificial swimming pool of the embryo. As the amniotic fluid is more viscous and gelatinous, it functions as an efficient shock absorber. Thus the embryo is protected from external as well as internal mechanical pressures. The amnion prevents the adhesion of embryo to the other parts. The amnion prevents the adhesion of embryo to the other parts. The amnion provides facilities for the free movement of the embryo. It helps in respiration

Answer 2

placenta provide oxygen and some nutrients to foetus.
amino sac keep the temperature consistently and used a protecting agent in the uterus area when mother accidently falls.
hope it helps✌