Some women use a contraceptive pill that contains only a hormone similar to progesterone.
This pill does not always stop eggs being released, but it still reduces the chance of pregnancy. It causes the mucus at the cervix to become thicker and the uterus lining to become thinner.
Explain how thicker mucus at the cervix reduces the chance of pregnancy.
Explain how a thinner uterus lining reduces the chance of pregnancy.
The combined pill contains hormones similar to oestrogen and progesterone.
Suggest why the combined pill is more effective than the progesterone-only pill.
48 exam-style questions on Edexcel GCSE Biology 7.2 Reproductive hormones, covering 7.2.1 Stages of the menstrual cycle, 7.2.2 Hormonal control of the menstrual cycle, 7.2.3 Hormonal contraception, 7.2.4 Evaluating contraception methods, and 7.2.5 Hormones in Assisted Reproductive Technology. Each one has a worked solution and a mark scheme showing where the marks go.