A teacher writes five methods on the board: the copper releasing IUD, the pill, vasectomy, the…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A teacher writes five methods on the board: the copper releasing IUD, the pill, vasectomy, the condom and lactational amenorrhea.
- Which of them stops ovulation, by an action of the body or of hormones?
- Which of them stops the passage of the gametes?
- Which of them keeps the semen away from the female tract?
- Which of them reduces the movement of sperms by releasing ions?
- Which one protects against sexually transmitted infections?
Need a reminder? The key ideaShow
A failure rate is the number of pregnancies in the first year among users. Among couples, about pregnancies are expected in a year. The chance of at least one pregnancy in years is . Only the condom, among the methods of this chapter, protects against STIs. Vasectomy and tubectomy are terminal methods.
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. Five methods.
Plan. Match each method to the step that it stops.
Step 1. Ovulation. The pill and lactational amenorrhea. The pill keeps FSH and LH low. In intense lactation, ovulation does not take place.
Step 2. The passage of the gametes. Vasectomy. It blocks the vas deferens.
Step 3. The semen. The condom, which is a barrier that covers the penis, or the vagina and cervix in the female condom.
Step 4. The ions. The copper releasing IUD. The copper ions reduce the movement of sperms.
Step 5. Infection. The condom.
Answer: the pill and lactational amenorrhea; vasectomy; the condom; the copper releasing IUD; the condom.
Check. Each method appears at least once, and the condom appears twice, for the barrier action and for the protection against infection.
Watch out. The pill acts at other steps too. It stops implantation and changes the cervical mucus.
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