Hormones and Reproduction 1
The graph in Figure 1 shows the levels of two hormones in a woman’s body at different stages of the menstrual cycle. Figure 1 Hormone B Hormone A Level
Day of the Cycle
a) Both hormones are produced by the ovaries. Complete the following table. Name of Hormone
One Function of Hormone
Hormone A Hormone B
[4]
b) Mark on the graph the approximate time of the following events: i) Mark the time of ovulation with an X.
[1]
ii) Mark the time of menstruation with a Y.
[1]
c) Two other hormones are involved in the menstrual cycle. i) The levels of FSH are high in the first half of the cycle. Explain why.
[2] ii) The levels of LH are highest in the middle of the cycle. Explain why. [1] 2
Explain how the hormones in the contraceptive pill can prevent pregnancy occurring.
[3] Total Marks
302
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GCSE Combined Science Workbook
227841 AQA Higher Tier Combined Science All-in-One_P286_310.indd 302
6/29/16 12:19 PM