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प्रश्न
The circulatory system of the fetus and that of the mother are never connected directly. What are the advantages?
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उत्तर
The separate circulatory system facilitates quick diffusion of nutrients, metabolic waste and respiratory gases between the foetus and the mother. Bacteria and other pathogens cannot pass from the mother to the foetus because they are filtered out by the placenta. Blood pressure changes in the maternal circulation also cannot affect the foetus which has delicate blood vessels.
संबंधित प्रश्न
Name the following:
The canal through which the testes descend into the scrotum just before birth in human male child.
Given below are the names of certain stages/substances related to reproduction and found in human body. Answer the questions related to them.
Gestation
• What is its meaning?
• How long does it normally last?
Differentiate
Amnion and Chorion.
Give Technical Term:
A structure which connects the placenta with the fetus.
Complete the following sentences with appropriate word:
The period of complete development of the fetus until birth is termed ______.
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 |
Name the following:
Two hormones secreted from placenta.
Heart and blood vessels have been formed by the end of five weeks of pregnancy.
Which characteristic describes the direction of blood flow through the umbilical arteries?
The placenta is described as a temporary structural and functional connection between which two circulations?
