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प्रश्न
Except endocrine function, what are the other functions of placenta.
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उत्तर
Placenta facilitates the supply of oxygen and nutrients to the embryo. It also removes CO2 and excretory wastes produced by embryo.
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संबंधित प्रश्न
Medically it is advised to all young mothers that breast-feeding is the best for their newborn babies. Do you agree? Give reasons in support of your answer.
Choose the correct options of the following question:
Eyelids in human foetus separate in :
The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?
Which of the following hormones is not a secretory product of human placenta?
Relaxin is the hormone secreted by the placenta.
Which of the following is not a function of the placenta?
Placenta is
Draw a diagram showing human foetus within the uterus and label any four, parts in it.
Explain the phases in embryonic development from the morula stage till the establishment of pregnancy in a human female.
Match the columns I and II with reference to weeks of pregnancy and the development of a human embryo. Select the correct option from the choices given below:
| Column I | Column II | ||
| I. | 8 weeks | (P) | Limbs and external genital organs |
| II. | 12 weeks | (Q) | Limbs and digits develop. |
| III. | 20 weeks | (R) | Body hair develops. |
| IV. | 24 weeks | (S) | Eyelids separate. |
The diagram given below shows the early embryonic stages of fish, reptiles, birds and humans. Though adult reptiles, birds and mammals breathe air, their embryos possess gills. How does this fact support evolution?
Assertion A: Breast-feeding during initial period of infant growth is recommended by doctors for bringing a healthy baby.
Reason R: Colostrum contains several antibodies absolutely essential to develop resistance for the new born baby.
In the light of the above statements, choose the most appropriate answer from the options given below:
What are the finger-like projections of the outer embryonic layer that penetrate the uterine wall called?
What is the ability of stem cells to differentiate into any tissue or organ of the body called?
During which trimester does organogenesis, the formation of all major organs, primarily occur?
Which hormone is secreted by the ovary in the later phase of pregnancy to relax pelvic ligaments for delivery?
During which trimester does rapid growth and weight gain in preparation for birth occur?
Which maternal hormones increase several-fold during pregnancy to support fetal growth and metabolic changes?
Which external genital structures become distinguishable and well-developed by the end of 12 weeks?
