In one cycle, an egg is released on day 15. Progesterone remains high until day 25, then progesterone and oestrogen both fall. No pregnancy occurs.
Which sequence is most likely after day 25?
the lining loses hormonal support, then implantation occurs
the lining loses hormonal support, then menstruation begins
the lining gains hormonal support, then implantation occurs
the lining gains hormonal support, then menstruation begins
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.