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प्रश्न
Describe briefly the ways how a mammalian embryo is respires
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उत्तर
The mammalian embryo respires by the diffusion of oxygen through the placenta to enter the bloodstream of the embryo. The waste carbon dioxide passes through the umbilical cord and leaves through the placenta.
संबंधित प्रश्न
Correct and rewrite the statements by changing the biological term that is underlined for the statement:
The protective sac which develops around the developing embryo is called the Pericardium.
What changes occur at the time of birth?
Name the Following
The expulsion of the fetus from the body of the mother.
Write the functional activity of the following structure:
Uterus
Write the functional activity of the following structure:
Amnion
Which of the following reproductive structures is responsible for secretion of hCG?
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 |
When does the placenta remain functional during pregnancy?
The average gestation period from conception to parturition is approximately how many days?
