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Figure 15 shows the changes in the levels of the hormones of the menstrual cycle - Edexcel - GCSE Biology - Question 8 - 2023 - Paper 2

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Figure 15 shows the changes in the levels of the hormones of the menstrual cycle. The maximum concentration of oestrogen is just before ovulation. Which is the max... show full transcript

Worked Solution & Example Answer:Figure 15 shows the changes in the levels of the hormones of the menstrual cycle - Edexcel - GCSE Biology - Question 8 - 2023 - Paper 2

Step 1

Which is the maximum concentration of oestrogen?

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Answer

The maximum concentration of oestrogen, as indicated in Figure 15, is D 900pg/ml, which occurs just before ovulation.

Step 2

Explain how two of the hormones shown in Figure 15 cause ovulation.

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Answer

  1. Luteinizing Hormone (LH): As the levels of oestrogen rise, they trigger a surge in LH. This surge is crucial for initiating ovulation, as it leads to the release of the egg from the ovary.

  2. Follicle-Stimulating Hormone (FSH): While its primary role is in the maturation of the ovarian follicles, FSH works in conjunction with oestrogen to regulate the menstrual cycle and prepare the body for ovulation, enhancing the responsiveness of the follicles to the LH surge.

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