5.3 Hormonal coordination in humans

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Question 13
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Table 1 gives information about three different methods of contraception.

Table 1

Method of contraceptionNumber of pregnancies per 100 women in one yearFeatures and possible side effects
Hormonal Intrauterine System (IUS)0.20.20.2Lasts for up to 555 years; releases progestogen directly into the uterus; can cause irregular bleeding or lighter periods.
Combined Contraceptive Patch999Applied to skin and changed weekly; releases estrogen and progestogen; can cause skin irritation or headaches.
Diaphragm with spermicide121212Placed over the cervix before sex; contains no hormones; can cause vaginal irritation or urinary tract infections.

A woman is choosing a contraceptive method. She wants a method that:

  • has a very low pregnancy rate (fewer than 111 pregnancy per 100 women per year)
  • does not use estrogen (due to a family history of blood clots)
  • does not require weekly maintenance or preparation immediately before sex
a.

Identify which method of contraception from Table 1 best meets all of her requirements.

[1]
b.

Suggest two disadvantages of the chosen method, using information from Table 1 and your own knowledge.

[4]

5.3 Hormonal coordination in humans Questions

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