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प्रश्न
Explain Rh factor incompatibility during pregnancy.
उत्तर
The human beings who have antigen on RBCs are Rh+ while others who do not have are Rh. It is through Rh+ is dominated over Rh- which is recessive.
In a marriage between Rh– woman and Rh+ man, when a woman becomes pregnant, she becomes sensitive while carrying a first Rh+ child within her womb. It is because some of the RBCs from the developing embryo get into the blood stream of mother during development causing her to produce anti-Rh-antibodies. The first child of such parents is normal and is delivered safely. However, if such a mother get pregnant again the resulting Rh+ foetuses will be exposed to anti-Rh-bodies produced by the mother.
As a result serious damage to RBCs of the developing embryo will occur causing erythroblastosis foetilis. The disease leads to the death of the developing embryo before birth or after parturition.
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संबंधित प्रश्न
(a) Arrange the following hormones in sequence of their secretion in a pregnant woman.
(b) Mention their source and the function they perform :
hcG, LH, FSH, Relaxin
State the Function of Chorionic Villi
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?
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
Subject 2 has a higher level of hormone B, which is ______
hCG is secreted by ______
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?
