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प्रश्न
Give Reasons
The full-grown human embryo respires but does not breathe.
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उत्तर
The full-grown human embryo respires because the dissolved oxygen in the mother’s blood diffuses into the embryo and is used in the oxidation of glucose in the cells with the liberation of energy. However there are no breathing movements as the lungs lie collapsed in the embryo and the only function after the fetus is expelled from the mother’s body. Therefore no breathing movements in the embryo as it receives oxygen by diffusion of gases.
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संबंधित प्रश्न
Describe briefly the ways how a mammalian embryo is respires
Complete the following sentences with appropriate word:
The umbilical cord connects _______
All are functions of placenta, EXCEPT ______.
In human beings, the placenta is formed by ______.
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 |
Mention any two functions of the human foetal placenta.
Assertion (A): The foetus respires but does not breathe.
Reason (R): The maternal blood supplies oxygen to the foetus through placenta.
Name the following:
Two hormones secreted from placenta.
Heart and blood vessels have been formed by the end of five weeks of pregnancy.
Mother's blood flows into the foetus through placenta.
