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Figure 8 shows the changes in the levels of the hormones of the menstrual cycle - Edexcel - GCSE Biology Combined Science - Question 5 - 2023 - Paper 2
Question 5
Figure 8 shows the changes in the levels of the hormones of the menstrual cycle. (a) (i) The maximum concentration of oestrogen is just before ovulation. Which is ... show full transcript
Worked Solution & Example Answer:Figure 8 shows the changes in the levels of the hormones of the menstrual cycle - Edexcel - GCSE Biology Combined Science - Question 5 - 2023 - Paper 2
Step 1
Step 2
Explain how two of the hormones shown in Figure 8 cause ovulation.
Answer
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FSH levels remain low, preventing the maturation of an egg or follicle. If FSH levels were high, follicles would mature and possibly lead to ovulation.
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LH levels remain low initially, which means that ovulation does not occur until a peak in LH levels signals it to happen. The surge in LH triggers the release of the egg.
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Additionally, progesterone inhibits FSH and oestrogen inhibits FSH, preventing premature ovulation by controlling hormone levels.
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Furthermore, high levels of oestrogen help to maintain the lining of the uterus, preparing it for potential implantation.