What is the mechanism action involved in female sterilization through tubal ligation?

Correct option is B

Tubal ligation, also known as female sterilization, involves surgically blocking or sealing the fallopian tubes, preventing sperm from reaching the egg and thereby preventing fertilization.
Explanation of each option:
· (a) Thickens cervical mucus – Incorrect. This is the mechanism of action for certain hormonal contraception methods, such as birth control pills, which prevent sperm from reaching the egg by altering cervical mucus.
· (b) Blocks fallopian tubes – Correct. Tubal ligation directly blocks the fallopian tubes, which prevents the egg from traveling to the uterus and the sperm from reaching the egg.
· (c) Blocks sperm from entering the uterus – Incorrect. This is the action of methods like condoms or diaphragms, which act as barriers.
· (d) Prevents ovulation – Incorrect. Preventing ovulation is the primary mechanism of action for hormonal contraceptives, such as birth control pills or IUDs, but not for tubal ligation.