A health poster lists ten methods of birth control: periodic abstinence, withdrawal, the male…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A health poster lists ten methods of birth control: periodic abstinence, withdrawal, the male condom, the diaphragm, the copper releasing IUD, the pill, the injectable, the implant, vasectomy and tubectomy.
- How many of them can be used by a female only?
- How many of them protect against sexually transmitted infections?
- How many of them have a poor chance of reversal?
- Which of the ten is a natural method that needs no device?
Need a reminder? The key ideaShow
Periodic abstinence avoids coitus on days to of a cycle of days. In the model, ovulation is days before the next period, and the fertile days run from days before ovulation to days after it. Condoms are used once, and they also protect against STIs. An IUD is placed by a trained person. Copper ions reduce the movement of sperms.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. The ten methods.
Plan. Go through the list and mark each method for each question.
Step 1. Female only. The diaphragm, the copper IUD, the pill, the injectable, the implant and tubectomy. That is .
Step 2. Protection against STIs. The male condom only. That is .
Step 3. Poor reversal. Vasectomy and tubectomy, the two surgical methods. That is .
Step 4. Natural methods. Periodic abstinence and withdrawal use no device. Both are natural methods.
Answer: ; ; ; periodic abstinence and withdrawal.
Check. The group sizes: natural , barrier (the condom and the diaphragm), IUD , hormonal (the pill, the injectable, the implant) and surgical . The total is .
Watch out. The female condom also protects against infection, but it is not in this list.
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