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Methods of contraception include use of hormones and barrier methods - Edexcel - GCSE Biology Combined Science - Question 4 - 2021 - Paper 1
Question 4
Methods of contraception include use of hormones and barrier methods. (i) Which form of contraception is a barrier method? A oral contraception B female condom... show full transcript
Worked Solution & Example Answer:Methods of contraception include use of hormones and barrier methods - Edexcel - GCSE Biology Combined Science - Question 4 - 2021 - Paper 1
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Explain how high levels of oestrogen and progesterone in the combined contraceptive pill work together to prevent pregnancy.
Answer
High levels of oestrogen and progesterone in the combined contraceptive pill inhibit the production of follicle-stimulating hormone (FSH), preventing eggs from maturing. They also inhibit the production of luteinizing hormone (LH), which prevents ovulation. If no eggs are matured and released, fertilization cannot occur.
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Explain how clomifene therapy can improve female fertility.
Answer
Clomifene therapy works by inhibiting estrogen feedback on the hypothalamus, which leads to increased secretion of follicle-stimulating hormone (FSH) and luteinizing hormone (LH). This stimulates the ovaries to produce more eggs, increasing the chances of ovulation.
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Explain how IVF can improve female fertility.
Answer
In vitro fertilization (IVF) involves manually combining eggs and sperm in a laboratory setting. After fertilization, the embryos are transferred to the uterus, bypassing potential issues in the fallopian tubes or with ovulation. This method greatly increases the chances of conception for women facing fertility challenges.