Out Of Phase - GCSE Biology Definition

Reviewed by: Lára Marie McIvor

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'Out of phase' describes when two or more repeating events, such as waves or biological cycles, do not occur at the same time — their peaks and troughs happen at different points. In GCSE Biology, this term is relevant when studying biological rhythms, like sleep cycles or hormone release patterns. When processes are out of phase, they are not synchronised, which can affect how well body systems work together. Understanding whether biological cycles are in or out of phase helps explain how living organisms maintain coordination and balance.

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Lára Marie McIvor

Reviewer: Lára Marie McIvor

Expertise: Biology, Psychology & Sociology Subject Lead

Lára graduated from Oxford University in Biological Sciences and has now been a science tutor working in the UK for several years. Lára has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning.

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