Advertisements
Advertisements
प्रश्न
Why does menstruation occur?
Advertisements
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
How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?
Differentiate between the following pair:
Uterus and vegina
Give appropriate term of the following:
The monthly discharge of blood and disintegrated uterine tissues in human female.
Give appropriate term of the following:
The process of fusion of ovum and sperm.
The diagram alongside is the vertical section of female reproductive organs. Study the diagram and answer the questions that follow:
(i) Name the fully developed part of ovary containing the ovum.
(ii) Name the organ of the female body in which the foetus develops.
(iii) What is ovulation?
(iv) Which two hormones are secreted by ovary?
State names of organs in the female reproductive system.
Complete the table.
| Sex/Gender | Reasons of infertility |
| Female | |
| Male |
Identify the term used for isthmus.
Primordial follicle cells undergo mitotic division to produce ______.
The finger-like projections, called fimbriae, help in the collection of ovum into the fallopian tube following ovulation.
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
If the peak of Hormone A does not appear in the study for Subject 1, which of the following statement is true?
How does fertilisation take place? Fertilisation occurs once in a month. Comment.
Match the following:
| Ovaries | Bean shape |
| Fallopian tubes | Almond shape |
| Uterus | Funnel – shape |
| Kidney | pear-shaped |
What is parturition?
Which part of the female reproductive system is paired incorrectly with its function?
The______ is also called the womb.
Sketch and label - Graafian follicle.
List two roles of the Oviduct in the human reproductive system.
The ______ is also called the womb.
The ______ is also called the womb.
