List and explain in brief three methods of contraception.
Three different methods of contraception:
1.Barrier method: Physical devices like condoms, diaphragm and cervical caps are used. They prevent entry of sperm in female genital tract, so, act as a barrier between them.
2.Chemical method: They act by changing hormonal balance of body so that eggs are not released and fertilisation cannot occur. Females use two types of pills for preventing pregnancies, that is oral pills and vaginal pills.
Oral pills has hormones that stop ovaries from releasing ovum into fallopian tube. It is also called oral contraceptives. Other contraceptive devices are loop or copper-T, are placed in uterus to prevent pregnancy.
3.Surgical method: They are carried out in males and females.
- In males, a small portion of the sperm duct (vas deferens) is blocked by surgical operation. It prevents the eggs to reach the uterus.
- In females, fallopian tubes are cut and tied.