Question

scientific understanding of the menstrual cycle of human females helps as a contraceptive measure

Answer 1

Scientific understanding of menstrual cycle of human females are very important as a contraceptive measures.
It helps in following ways :
(i) Safe period (Rhythm method)

A week before and a week after menstrual bleeding is considered as safe period for sexual intercourse.
The idea is based on following facts :
(A) Ovulation occurs on 14th day of cycle and ovum survives for about 2 days.
(B) Sperms remain alive for about 3 days.
This method reduces the chances of pregenancy by about 80%.

(ii) Pills used by females are also dependent on menstrual cycle. The pills have to be taken daily for a period of 21 days starting preferably within first five days of menstrual cycle.

It is repeated again after period of 7 days.

Hope your doubt is clear

Answer 2

Menstrual Cycle

Explanation:

• The typical length of time between the primary day of one period and the first day of the following is 21 to 45 days in young woman and 21 to 35 days in grown-ups (a normal of 28 days)
• Menstruation cycle quits happening after menopause which for the most part happens somewhere in the range of 45 and 55 years old
• Bleeding usually is the most part keeps going around 3 to 7 days  
• The four periods of the menstrual cycle are feminine cycle, the follicular stage, ovulation and the luteal stage
• Basic menstrual cycle incorporate overwhelming or difficult periods and premenstrual syndrome (PMS). When in the menstrual cycle a woman is destined to consider can expand the opportunity of pregnancy