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प्रश्न
How is Placenta formed? What are its functions?
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उत्तर
It is formed by the union of uterine endometrial tissue, chorion, and allantois (embryonic tissue). It is attached to the wall of the uterus and through it, the exchange of nutrients, hormones, respiratory gases, and urea occurs between the fetal and maternal circulation.
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संबंधित प्रश्न
What is the significance of amniotic fluid?
Give appropriate biological or technical terms for the following :
The fluid which surrounds the foetus
Name the following:
The body part in which the embryo develops.
State whether the following statements are TRUE (T) or FALSE (F):
Rewrite the wrong statement by correcting only one word either at the beginning or at the end of the sentence.
Nutrition and oxygen diffuse from the mother’s blood into the foetus’s blood through amnion.
Name and describe very briefly, the stages in the development of human embryo.
What changes occur at the time of birth?
Give Reasons
The full-grown human embryo respires but does not breathe.
Complete the following sentences with appropriate word:
The period of complete development of the fetus until birth is termed ______.
Write the functional activity of the following structure:
Placenta
Match the respiratory surfaces to the organisms in which they are found.
| Organ/ cells | Hormones | ||
| (i) | Corpus luteum | (a) | HCG |
| (ii) | Leydig's cells | (b) | Estrogen |
| (iii) | Placenta | (c) | Progesterone |
| (iv) | Graafian follicle | (d) | Testosterone |
