Simulation · Biology · Class 12
A 28-day calendar: the pill and the fertile period
"A 28-day calendar: the pill and the fertile period" is a free, interactive Class 12 Biology simulation for NEET, built on the lesson "Pills, injectables and implants" in Reproductive Health. Drag the day through the cycle. The pack here is started on cycle day 1. Then switch to periodic abstinence and drag again. Pills: one a day for 21 days, begun within the first five days of the cycle, then 7 days off while menstruation occurs. Periodic abstinence: no coitus on days 10-17.
From the lesson Pills, injectables and implants in Reproductive Health. Change the values and watch what happens.
A 28-day calendar: the pill and the fertile periodBiology · Class 12
The idea behind it
NCERT §3.2
- Oral contraceptives ('pills') are small doses of progestogens alone or of progestogen-estrogen combinations, taken by females as tablets.
- Schedule: take one pill every day for 21 days, ideally beginning in the first five days of the cycle; stop for 7 days, when the period comes; then repeat the pattern for as long as pregnancy is to be avoided.
- Pills inhibit ovulation and implantation and change the quality of cervical mucus so that sperm entry is prevented or slowed.
- Pills are very effective, have fewer side effects and are well accepted by females.
- Saheli, developed at CDRI Lucknow, is a non-steroidal oral contraceptive taken once a week, with very few side effects and high contraceptive value.
- Progestogens alone or with estrogen can also be given as injections or as implants under the skin. They act like pills but stay effective for much longer.
- Emergency contraception: progestogens, progestogen-estrogen combinations or IUDs given within 72 hours of coitus are very effective, for example after rape or casual unprotected intercourse.
Questions
2 answers
- What does the "A 28-day calendar: the pill and the fertile period" simulation show?
- Drag the day through the cycle. The pack here is started on cycle day 1. Then switch to periodic abstinence and drag again.
- Is this simulation free?
- Yes. It is free and runs in the browser on a phone or a laptop. It belongs to the lesson "Pills, injectables and implants" in Reproductive Health (Class 12 Biology).
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