Menstruation occurs when a mature egg is released from the ovary.
Thus the correct option is A.
What are the phases of mensuration cycle?
The menstrual cycle is divided into four phases:
- Menstrual phase: Day 1 of period, uterus lining that is prepared for implantation starts to shed which lasts 3 to 5 days.
- Follicular phase: In this phase, the primary follicle starts developing into a mature Graffian follicle. The endometrium also starts proliferating. The uterus starts preparation for another pregnancy.
- Ovulatory phase: Mid-cycle phase, this is the phase in where ovulation takes place that is day 13-17. The end of the follicular phase along with the ovulation period defines the fertilization period.
- Luteal phase: It is the post-ovulation phase, where the fate of the corpus luteum is decided. If fertilization occurs, pregnancy starts. If fertilisation doesn’t occur, it marks the onset of another cycle.
In a life cycle, a woman’s body is vulnerable to a variety of changes. The cycle of these changes occur in women every month, positively for pregnancy is known as the menstrual cycle.
For more information regarding mensuration cycle, visit:
https://brainly.com/question/1483249
#SPJ2
