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Figure 17 shows the concentration of the hormones oestrogen and progesterone in the blood of women of different ages - Edexcel - GCSE Biology - Question 9 - 2018 - Paper 1
Question 9
Figure 17 shows the concentration of the hormones oestrogen and progesterone in the blood of women of different ages. (i) Use information from Figure 17 to explain ... show full transcript
Worked Solution & Example Answer:Figure 17 shows the concentration of the hormones oestrogen and progesterone in the blood of women of different ages - Edexcel - GCSE Biology - Question 9 - 2018 - Paper 1
Step 1
Use information from Figure 17 to explain why women over the age of 50 are less likely to ovulate.
Answer
Women over the age of 50 have low levels of oestrogen, which is crucial for triggering the release of luteinizing hormone (LH). Without sufficient oestrogen, the levels of LH are too low for ovulation to occur. Additionally, a surge of LH is required for ovulation, and its absence contributes to decreased ovulation frequency in this age group.
Step 2
Use information from Figure 17 to explain why women are less likely to menstruate after the age of 60.
Answer
After the age of 60, women experience low levels of oestrogen. These low levels prevent the lining of the uterus from building up adequately. As a result, there is insufficient tissue for menstrual shedding, leading to reduced likelihood of menstruation.