Question

Explain how the intake of oral contraceptive pills prevent pregnancy in humans.

Answer 1

Synthetic hormones that control the menstrual cycle are commonly used in oral contraceptive pills. These hormones can:

1. Prevent ovulation: The hormones can stop the release of an egg from the ovaries.
2. Thin the uterine lining: This makes it less likely for a fertilised egg to implant.
3. Thicken cervical mucus: This makes it difficult for sperm to reach the egg.