What is menstruation?
Bleeding from uterus is called menstruation or menstrual flow
It occurs every month in woman (and is not observed in men)
It begins from puberty till the age of 45-50 years
Reason for Menstruation
When females reach puberty, they develop ovaries
Ovaries release ovum (egg)
One ovum matures once in a month (28-30 days)
Uterus develops a thick wall to receive fertilised egg
If this ovum is fertilized by egg, it leads to pregnancy
If it is not fertilized,the egg ,thick lining of uterus and blood vessel are shed by body
This leads to bleeding in girls and is called menstruation or menstrual flow
It lasts for 2 to 8 days.
This cycle repeats every month and is called menstrual cycle.
What is menarche?
First time menstruation (bleeding) is called menarche
Women get menarche at time of puberty(10-12 years)
What is menopause?
At 45-50 years of age, menstruation (bleeding) stops. This is called menopause.
NCERT Question 3 - What is menstruation? Explain.