How do ‘implants’ act as an effective method of contraception in human females ? Mention one advantage of implants over contraceptive pills.
How do ‘implants’ act as an effective method of contraception in human females ? Mention one advantage of implants over contraceptive pills.
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Solution and Explanation
Contraceptive implants are small rods or capsules placed under the skin of the upper arm. They contain a hormone, usually a progestogen, which is released slowly.
Step 2: How they prevent pregnancy:
The hormone stops ovulation, so no egg is released. It also makes the cervical mucus thick, which blocks the entry of sperm. It thins the uterine lining, so implantation is hindered. Together these actions make implants highly effective.
Step 3: Advantage over pills:
Implants last for several years once placed. A woman need not take a tablet every day, so there is no risk of missing a dose.
Final Answer:
Implants release a hormone that stops ovulation, blocks sperm and prevents implantation. Their advantage is long-lasting action without a daily dose.
\[ \boxed{\text{Hormone release; long-term, no daily dose}} \]
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