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

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Get ready for the OCR GCSE Biology exam with our comprehensive quiz, featuring flashcards and multiple choice questions. Understand the exam format, key topics, and effective study strategies to excel.

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What is the typical duration of the menstrual cycle?

21 days
28 days
30 days
35 days

The correct answer is: 28 days

The typical duration of the menstrual cycle is about 28 days, although it can vary from person to person. This cycle begins on the first day of menstruation and ends just before the next period starts. The 28-day cycle is often regarded as the average or standard length, as it is seen in many women. However, cycles can range from 21 to 35 days and still be considered normal. Understanding the average duration helps in tracking ovulation and overall menstrual health, making it easier for individuals to recognize any abnormalities in their cycle.