The menstrual cycle

9.If the menstrual cycle is 28 days and ovulation occurs on day 14, on which day would menstruation begin if fertilisation does not occur?

10.A woman has a menstrual cycle that lasts 32 days. If ovulation occurs 14 days before the end of the cycle, on which day does ovulation occur?

11.During which stage of the menstrual cycle does the uterus lining break down and leave the body?

12.Which hormone is primarily responsible for thickening the uterus lining before ovulation?

13.A clinical trial studies a new contraceptive pill that keeps progesterone levels high throughout the cycle. What effect would this have on the menstrual cycle?

14.What is the typical length of the menstrual cycle?

15.The diagram shows the female reproductive system. Which part releases the egg during ovulation?

16.A researcher measures the thickness of the uterus lining (mm) on different days of a 28-day cycle: day 1: 2 mm, day 7: 4 mm, day 14: 8 mm, day 21: 12 mm, day 28: 2 mm. What is the percentage increase in thickness from day 1 to day 21?

17.In a fertility treatment, a woman is given injections of oestrogen early in her cycle. What is the likely effect on the uterus lining?

18.After ovulation, which hormone helps to maintain the uterus lining?

19.A study compares the menstrual cycles of two groups: Group A has an average cycle length of 28 days, Group B has an average of 35 days. Assuming ovulation occurs 14 days before the end of the cycle, on which day does ovulation occur in Group B?

20.A scientist wants to investigate the effect of a hormone on the thickness of the uterus lining in mice. Which experimental design would provide the most reliable evidence?

21.In an experiment, a group of women tracked their basal body temperature (BBT) daily. The BBT rises slightly after ovulation due to increased progesterone. If a woman's BBT rises on day 16 of a 28-day cycle, which statement is most likely correct?

22.Which hormone is responsible for thickening the uterus lining before ovulation?

23.A woman has a 35-day menstrual cycle. Assuming ovulation occurs 14 days before the end of the cycle, on which day does ovulation occur?

24.A student measures the thickness of the uterus lining (in mm) on different days of a 28-day cycle: day 1: 2 mm, day 7: 4 mm, day 14: 8 mm, day 21: 12 mm, day 28: 2 mm. Which conclusion is supported by the data?

25.A new contraceptive pill contains a high dose of progesterone. What effect does this have on the menstrual cycle?

26.A graph shows the levels of oestrogen and progesterone over a 28-day cycle. Oestrogen peaks around day 13, and progesterone peaks around day 21. Which statement is correct?

27.Which stage of the menstrual cycle is a woman most fertile?

28.The menstrual cycle typically lasts around how many days?

29.A scientist measures the length of the menstrual cycle in 100 women and finds an average of 29 days with a standard deviation of 3 days. Which statement is most accurate?

30.In an experiment, researchers measure the concentration of oestrogen and progesterone in blood samples from women at different stages of the menstrual cycle. They find that oestrogen is high on day 12, and progesterone is high on day 22. If a woman has a cycle length of 30 days, on which day is she most likely to ovulate?

31.Ovulation usually occurs around which day of a 28-day menstrual cycle?

32.During menstruation, what is shed from the body?

33.If a woman has a 35-day menstrual cycle and ovulation occurs 14 days before the end of the cycle, on which day does ovulation occur?

34.Which of the following statements about the menstrual cycle is true?

35.A researcher measures the thickness of the uterus lining (mm) on different days of a 28-day cycle: day 1: 2 mm, day 7: 4 mm, day 14: 8 mm, day 21: 12 mm, day 28: 2 mm. On which day does ovulation most likely occur?

36.Which hormone is responsible for maintaining the uterus lining after ovulation?

37.A woman has a 30-day menstrual cycle. If ovulation occurs 14 days before the end of the cycle, on which day does ovulation occur?

38.A scientist measures the concentration of oestrogen and progesterone in blood samples from women at different stages of the menstrual cycle. The results show that oestrogen peaks around day 13 and progesterone peaks around day 21. Which statement best explains these observations?

39.Ovulation is when an ovary releases an egg.

40.The menstrual cycle usually lasts around 28 days.

41.A woman is most fertile before she ovulates.

42.Match each stage of the menstrual cycle to its description.

43.Put the following events of the menstrual cycle in the correct order, starting from day 1.

44.Which of the following statements about the menstrual cycle are true? Select all that apply.

45.A woman is most fertile after she ovulates.

46.Which hormone is responsible for maintaining the thickness of the uterus lining after ovulation?

47.During which stage of the menstrual cycle does the uterus lining thicken under the influence of oestrogen?

48.A woman has a 28-day cycle. On day 1, menstruation begins. On which day would ovulation most likely occur?

49.Describe what happens in the first five days of the menstrual cycle.

50.State which day of the menstrual cycle ovulation usually happens on (assuming a 28-day cycle).

51.Describe what ovulation is.

52.Describe what happens to the uterus lining if an egg isn't fertilised.

53.Describe the role of oestrogen in the menstrual cycle.

54.Describe the role of progesterone in the menstrual cycle.

55.Complete the sentence about the menstrual cycle.

56.If a woman has a 32-day menstrual cycle and ovulation occurs 14 days before the end of the cycle, on which day does ovulation occur?

57.Describe what happens to the uterus lining if an egg is not fertilised.

58.State which day of the menstrual cycle ovulation usually happens on (assuming a 28-day cycle).

59.If a woman has a 32-day menstrual cycle and ovulation occurs 14 days before the end of the cycle, on which day does ovulation occur?