Physiology
Ovarian cycle, ovulation and periods
Updated: 3 October 2026
Understand through movement
Ovulation
Nucleus Medical Media · Video in English
Subject illustration · OpenStax / Rice University · CC BY 4.0
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Menstrual Cycle: A Brief Definition
Nucleus Medical Media · Video in English
Subject illustration · OpenStax / Rice University · CC BY 4.0
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01The role
Ovaries and uterus respond to hormonal signals; cycle length varies.
02The mechanism
A follicle may release an egg at ovulation. This does not always happen on day fourteen.
03Coordination
The uterine lining prepares for pregnancy. Without pregnancy, part of it is shed during menstruation.
04Key point
A calendar alone cannot confirm ovulation and is not a reliable contraceptive method on its own.
Medical references
This general information does not replace a consultation. Tests and treatments are selected for each individual; they are not a routine checklist.
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