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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.
APPEARS IN
संबंधित प्रश्न
Mention the functions of Ovary.
In female, after how much time after fertilization, does the fertilized egg get implanted in the
uterine wall?
Give appropriate term for the following:
The onset of reproductive phase in a female.
Sketch the labelled diagram.
Human female reproductive system.
The diagram given below represents a system in the human body. Stud the diagram and answer the following questions: 
Mention the number and the name of the part involved in fertilization and implantation from the above diagram.
Give appropriate term of the following:
The process of fusion of ovum and sperm.
Given below is a diagram of the female reproductive system of a human being
(i) Name the parts numbered 1 to 6.
(ii) Normally after how many days does an ovary release an egg?
(iii) Where are the sperms released during coitus?
(iv) What do the sperms do after being released?
(v) What is the function of the organ numbered 5?
(vi) How many days does it normally take from the fertilization of the egg up to the birth of the baby?
Complete the following sentences with appropriate word:
The female equivalent of the penis is the _______.
State the Location:
Ovary
Multiple Choice Question:
Corpus luteum in mammals occurs in
Name the part of the human female reproductive system where the following occurs.
Implantation
Which part of the fallopian tube collects to ovum after ovulation?
The development of lactiferous tubules during pregnancy is dependent on ____________.
Which of the following is correct about mammalian testes?
Bartholin’s glands are situated ______.
To produce 400 seeds, the number of meiotic divisions required will be ______
The embryo in humans gets nutrition from the mother’s blood with the help of a special tissue called ______
What is the other name for fallopian tubes?
One mature ovum is released once every ______ days.
The ______ is also called the womb.
