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प्रश्न
Why does menstruation occur?
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उत्तर
Menstruation is a process in which blood and mucous flow out every month through the vagina. This process occurs every month because one egg is released from the ovary every month and at the same time, the uterus (womb) prepares itself to receive the fertilised egg. Thus, the inner lining of the uterus gets thickened and is supplied with blood to nourish the embryo. If the egg does not get fertilised, then the lining of the uterus breaks down slowly and gets released in the form of blood and mucous from the vagina. It lasts for three to five days.
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संबंधित प्रश्न
Explain the concept of IVF.
Name the following:
The part of the female reproductive system in which fertilization occurs.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
The cilia lining the oviduct funnel, push the released ovum into the uterus.
State the Location:
Ovary
Write the functional activity of the following structure:
Graafian follicle
______ pollen mother cells should undergo meiotic division to produce 64 pollen grains.
Development of mammary glands is controlled by ____________.
In 28 days human ovarian cycle, ovulation occurs on ______.
The estrus cycle is a characteristic of ______.
Bartholin’s glands are situated ______.
The second maturation division of the mammalian ovum occurs ______.
The ability to reproduce is lost in a female after ______
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.
Site of fertilization in human is ______
How does fertilisation take place? Fertilisation occurs once in a month. Comment.
What is parturition?
What is the role of cervix in the human female reproductive system?
Draw a neat diagram of the female reproductive system and label the parts associated with the following:
(a) production of gamete
(b) site of fertilisation
(c) site of implantation
(d) birth canal
List two roles of the Oviduct in the human reproductive system.
Median vertical depression of external genitalia in females, enclosing the urethral and vaginal opening is ______.
Which part of the fallopian tube has a narrow lumen and connects the tube to the uterus?
