Write a short note on placenta.

Explanation

Placenta is the intimate connection between the foetus and uterine wall of the mother to exchange the materials. In humans, chorion takes part in the formation of placenta hence called chorionic placenta. It consists of foetal part, the chorion and a material part, the decidua basalis.
The degree of intimacy is so strong that the blood vessels of the chorionic villi are bathed in the mother.s blood. This type of placenta which is based on the intimacy between foetal and maternal parts of the placenta is referred to as haemochorial placenta. It provides many required hormones such as hCGH, nutrition, aids in respiration and excretion of the foetus.