OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Prepare for the OCR GCSE Biology Exam with detailed quizzes, flashcards, and explanations. Enhance your understanding of biology concepts and get exam-ready today!

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What role does LH play in the menstrual cycle?

It regenerates the ovary
It stimulates egg release
It produces oestrogen
It causes menstruation

The correct answer is: It stimulates egg release

LH, or luteinizing hormone, plays a pivotal role in the menstrual cycle, primarily by stimulating ovulation, which is the release of an egg from the ovary. This surge in LH levels occurs mid-cycle, typically around day 14 in a standard 28-day cycle, and is crucial for the process of ovulation. The increase in LH helps to complete the maturation of the follicle, leading to the release of the egg so that it can potentially be fertilized by sperm. The other options do not accurately describe the specific function of LH. While LH does contribute to the overall hormonal balance essential for the menstrual cycle, it is primarily known for its direct role in stimulating egg release rather than regenerating the ovary, producing oestrogen, or causing menstruation. Each of these processes is influenced by other hormones and feedback mechanisms within the hormonal regulation of the menstrual cycle.