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प्रश्न
Why is zona pellucid retained around the egg till it reaches the uterus?
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उत्तर
Zona pellucida prevents the implantation of the blastocyst at an abnormal site such as a fallopian tube and it keeps trophoblast cells unexposed till it reaches the uterus. Hence, zona pellucida is retained around the egg until it reaches the uterus.
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संबंधित प्रश्न
Why does menstruation occur?
Give the functions of the following:
Penis
What is true of gametes?
The part of fallopian tube closest to the ovary is ______.
Bartholin’s glands are situated ______.
Read the following and answer from given below:
During copulation, semen is released by the penis into the vegina. The motile sperms swim rapidly, fuse with the ovum in the ampullary region, resulting in fertilization. The haploid nucleus of sperm fuses with that of the ovum to form a diploid zygote.
What is the signifacance of fertilisation?
Sketch and label - Graafian follicle.
In which region is the female reproductive system located?
Which glands provide lubrication in the external genitalia?
How many mammary lobes does each breast have?
