Contraceptive action of combined pill is mainly due to_______________?
Correct answer: C. Inhibits ovulation
- A. Decrease in tubal motility
- B. Prevents the fertilization
- C. Inhibits ovulation
- D. Prevents the implantation of fertilized egg
Explanation
Combined oral contraceptives mainly suppress the hypothalamic-pituitary-ovarian axis, preventing the mid-cycle LH surge and therefore ovulation. Effects on cervical mucus and the endometrium provide additional protection but are not the primary mechanism.
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