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What is the menstrual cycle?
The menstrual cycle is a cycle that occurs every month in the female reproductive system. It often lasts about 28 days (and can commonly repeat in a 24–28 day range).
Key terms
Checkpoint
The menstrual cycle happens every month in the female reproductive system.
Which parts are included in the female reproductive system (as described)?
A menstrual cycle is always exactly 28 days for everyone.
What happens if the egg meets sperm?