Read Contraception by Method and Mechanism
Classify the method first, then check the mechanism: block sperm, suppress ovulation, alter the uterus, or use a temporary natural interval.
Living-system questions are solved by matching a structure or organism to its function, process and stated condition.
Match method to mechanism
Condoms and diaphragms physically block sperm; periodic abstinence avoids intercourse during the fertile window. Copper-bearing IUDs increase sperm phagocytosis and reduce fertilising capacity. Hormonal implants and oral pills can suppress ovulation; a Lippes loop does not.
Read pills and temporary methods carefully
Conventional combined pills are taken on a cycle schedule; Saheli is a weekly non-steroidal pill in the source material. Lactational amenorrhea is a temporary method after childbirth and is considered reliable only for a limited early period under specific conditions, not for two years.
Judge an ideal method
A contraceptive should be effective, reversible, accessible and have few side effects. It should not permanently impair sexual desire or fertility.
OlympIQ exam lens
- ✓Barrier methods prevent sperm and ovum from meeting.
- ✓Copper IUDs act locally; they do not inhibit ovulation.
- ✓Norplant releases progestogen and can inhibit ovulation.
- ✓Saheli is weekly; lactational amenorrhea is time-limited.
- ✓Contraception should be reversible with low side effects.
Do not assign a hormonal mechanism to every IUD. Distinguish copper devices, inert loops, pills and implants.
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