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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
Mention the functions of Uterus in the human female reproductive system.
In female, after how much time after fertilization, does the fertilized egg get implanted in the
uterine wall?
Rewrite the terms in the correct order so as to be in a logical sequence.
Sperm duct, penis, testes, sperms, semen.
Rewrite the terms in the correct order so as to be in a logical sequence.
Puberty, menopause, menstruals, menarche, reproductive age.
The diagram alongside is the vertical section of female reproductive organs. Study the diagram and answer the questions that follow:
- Name the fully developed part of ovary containing the ovum.
- Name the organ of the female body in which the foetus develops.
- What is ovulation?
- Which two hormones are secreted by ovary?
Name the following:
Organ producing ovum.
Complete the following statement by choosing the correct alternative:
Female copulatory organ ______.
Draw a label diagram.
Draw a sectional view of the human ovary showing the different stages of developing follicles, corpus luteum, and ovulation.
The below diagram represents the vertical view of the human female reproductive system.
(i) Label the parts indicated by the guidelines 1 to 8.
(ii) How does the uterus prepare for the reception of a zygote?
(iii) What happens to the uterus if fertilization takes place?
(iv) What happens to the uterus if fertilization has failed to take place?
The pair of thin folds present inner to the labia majora is ____________.
The development of lactiferous tubules during pregnancy is dependent on ____________.
Which of the following is a permanent method of contraception in a human female?
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
For subject 2 it is observed that the peak for hormone B has reached the plateau stage. After approximately how much time will the curve for hormone B descend?
The embryo in humans gets nutrition from the mother’s blood with the help of a special tissue called ______
Tubectomy is carried out by blocking the ______
In rabbits, humans and other placental mammals, fertilization occurs in ______.
______ receives the sperms and acts as a birth canal during childbirth.
With a suitable diagram, describe the organisation of mammary gland.
The ______ is also called the womb.
Which organs are the primary sex organs of the female reproductive system?
