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Question
Describe in brief the structure of placenta
Solution
Placenta is a collective set of special tissues which is composed of maternal and fetal segment.
It is a temporary part in the uterus of the mother, which is delivered out of the body when baby is born.
Structure:
-Placenta is in the shape of a flat disc.
-It is developed from parts called as chorion and allantois.
-It is found attached to the wall of uterus and connected to the fetus via umbilical cord.
-It has tree like branches called villi and are connected at the point called cotyledons on mother's organ.
Functions:
-Primary role is to feed the fetus. It transmits the nutrition from mother's blood to the embryo.
-Excretion of unwanted stuff is carried out.
-It also acts as a protective membrane and provides immunity.
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RELATED QUESTIONS
Name the parts of the human female reproductive system where
i. fertilisation takes place
ii. implantation of the fertilised egg occurs
The diagram given below is that of a developing human foetus. Study the diagram and then answer the questions that follow:
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(ii) Mention any two functions of the part labelled 2 in the diagram.
(iii) Explain the significance of the part numbered 3 in the diagram.
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Multiple Choice Question:
What will happen if the temperature of the scrotal sacs temporarily goes to about 2°C lower than body temperature?
Distinguish between Vasa efferentia and Vasa deferentia.
