An ultrasound clinic examines a patient's uterus at three times during one menstrual cycle.
P: during menstruation
Q: when a mature egg is released
R: seven days after Q
Which statement describes the uterus lining at P, Q and R?
At P, it is thickening; at Q, it is being maintained; at R, it is breaking down.
At P, it is being maintained; at Q, it is thickening; at R, it is breaking down.
At P, it is breaking down; at Q, it has thickened; at R, it is being maintained.
At P, it is breaking down; at Q, it is still thin; at R, it is starting to thicken.
90 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.