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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.
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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 membrane which protects the foetus and encloses a fluid
Give appropriate terms for the following:
Rupture of follicle and release of ovum from the ovary.
Match the items in column I with those in column II and write down the matching pairs (some may not match)
| Column I | Column II | ||
| a | Acrosome | 1 | An embryo which looks like human baby |
| b | Gestation | 2 | Luteinizing hormone |
| c | Menopause | 3 | ovum producing cells |
| d | Foetus | 4 | complete stoppage of menstrual cycle |
| e | Oogenesis | 5 | spermatozoa |
| f | Ovulation | 6 | Complete stoppage of menstrual cycle. |
| 7 | Time taken by a fertilized egg till the delivery of baby |
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.
What changes occur at the time of birth?
During pregnancy, which hormones are secreted by the placenta?
All are functions of placenta, EXCEPT ______.
Heart and blood vessels have been formed by the end of five weeks of pregnancy.
