What is the primary mechanism of action for permanent methods of birth control?
Preventing ovulation
Preventing fertilization
Blocking the fallopian tubes or vas deferens
Thickening cervical mucus
The primary mechanism of action for permanent methods of birth control, such as tubal ligation (for women) or vasectomy (for men), is the blocking or severing of the fallopian tubes (in women) or vas deferens (in men). This blocks the pathway for sperm or eggs, ensuring that fertilization cannot occur. This method is considered irreversible and provides a permanent form of contraception. It is important to note that this method does not affect hormone regulation or cervical mucus, which are mechanisms of action for other forms of birth control.
Option 3 is the correct answer.