Mention the frequency and duration of menstrual cycle in human females.
- Menstruation occurs if the ovum released by the ovary does not get fertilized by sperm at the time of ovulation . Since the process of menstruation in a woman occurs again and again after a fixed period of 28 days , it is also known as the menstrual cycle.
- The average duration of menstrual cycle is 28-30 days and can vary between women
- It lasts for 3- 7 days .