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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
When and where do chorionic villi appear in humans?
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Which of the following hormones is not a secretory product of human placenta?
In the development of the human body, the ectoderm is responsible for the formation of ______.
The early stage human embryo distinctly possesses ______.
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Read the following and answer from given below:
Cleavage is the series of rapid mitotic divisions in the zygote and forms blastula. The 2, 4, 8, 16 daughter cells are called blastomeres. An embryo with 64 blastomeres is known as a blastocyst and has a blastocoel cavity. Blastocyst gets implanted in the uterine wall and leads to pregnancy.
At which stage of embryonic development does trophectoderm develop?
Read the following and answer from given below:
Cleavage is the series of rapid mitotic divisions in the zygote and forms blastula. The 2, 4, 8, 16 daughter cells are called blastomeres. An embryo with 64 blastomeres is known as a blastocyst and has a blastocoel cavity. Blastocyst gets implanted in the uterine wall and leads to pregnancy.
The correct sequence of various structures formed during embryonic development is ______
The secondary sexual characters develop in females because:
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. |
