Question

explain the term:
1. implantation
2. placenta
3.what is the average duration of human pregnancy?
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Answer 1

Answer:

1. IMPLANTATION-In humans, implantation is the stage of pregnancy at which the embryo adheres to the wall of the uterus.

2. PLACENTA-the material inside the part of a woman’s body where a baby grows (womb) which protects the baby and supplies the food through a tube is known as placenta.

3.the average duration of human pregnancy is 280 days or 40 weeks

Answer 2

Answer:

(i) Implantation: The embedding

of a fertilised mammalian egg (embryo) into the inner thick wall of the uterus (womb) where it will continue its development is called implantation.

(ii) Placenta: It is a complex double-layered spongy vascular tissue in human female formed by the joint activity of maternal and foetal tissues in the wall of uterus that is meant for attachment, nourishment and waste disposal for the foetus.

(b) The average duration of human pregnancy is 40 weeks or 280 days.

Explanation: