Question

write short notes on placenta. ​

Answer 1

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The placenta is an organ that develops in your uterus during pregnancy. This structure provides oxygen and nutrients to your growing baby and removes waste products from your baby's blood. The placenta attaches to the wall of your uterus, and your baby's umbilical cord arises from it.

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Answer 2

Answer:

(1) Placenta is a temporary organ derived from the tissues ot the toetus as well as mother.

(2) Human placenta is called chorionic placenta as it is made up of chorion which is an extra-embryonic membrane.

(3) Blood vessels from the allantois vascularize the placenta.

(4) There are two parts of placenta, viz. foetal placenta and maternal placenta.

(5) Foetal placenta is formed of chorionic villi.

(6) Maternal placenta is formed of uterine wall which is in intimate contact with the chorionic villi.

(7) Chorionic vili recefve the blood from the embryo by umbilical artery. Umbilical vein returns the blood back to the embryo.

(8) Human placenta is said to be haemochorial because a part of placenta is from foetus which has chorlonie villi. The other highly vascularized part is from uterine wall of mother. Thus foetal and maternal placenta together is called haemocorial placenta.