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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 Uterus in the human female reproductive system.
Draw a diagrammatic sectional view of the female reproductive system of human and label the parts
(i) where the secondary oocytes develop
(ii) which helps in collection of ovum after ovulation
(iii) where fertilization occurs
(iv) where implantation of embryo occurs.
Name the function of the following:
Endometrium
Rewrite the terms in the correct order so as to be in a logical sequence.
Sperm duct, penis, testes, sperms, semen.
Name the following:
Organ producing ovum.
Explain the term Graffian follicle.
A neat labelled diagram describes the parts of a typical angiospermic ovule.
Which of the following is a permanent method of contraception in a human female?
Ovulation occurs under the influence of ______.
The opening of the vagina is often covered partially by a membrane called ______.
Figure A shows the front view of the human female reproductive system and Figure B shows the development of a fertilized human egg cell
Figure A
Figure B
Identify the correct stage of development of the human embryo (Figure B) that takes place at the sites X, Y, and Z respectively in the human female reproductive system (Figure A).
Choose the correct option from the table below:
| X | Y | Z | |
| A | Morula | Fertilized egg | Blastocyst |
| B | Unfertilized egg | Fertilized egg | Morula |
| C | Blastocyst | Fertilized egg | Unfertilized egg |
| D | Fertilized egg | Morula | Blastocyst |
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
Which of the following statements is true about the subjects?
The fertilization of the human egg by the sperm takes place in ______
In the given Figure label the parts and mention their functions
- Production of egg
- Site of fertilisation
- Site of implantation
- Entry of the sperms
In human beings, the correct sequence of events during reproduction is
Mother gives birth to a baby but the baby has characters of both parents. How is this possible?
What is the role of cervix in the human female reproductive system?
The ______ is also called the womb.
Write the specific location of the following:
Uterus
