The complete process by which cells break down glucose and other organic molecules to produce ATP, involving glycolysis, the citric acid cycle, and the electron transport chain. This process can occur with or without oxygen.
Combines 'cellular' from Latin 'cellula' meaning small room, with 'respiration' from Latin 'respirare' meaning to breathe. The term evolved in the early 20th century as scientists realized that the fundamental 'breathing' process actually occurs inside individual cells.
Cellular respiration is like your body's internal combustion engine, but incredibly more sophisticated - it carefully extracts energy from food molecules in controlled steps rather than burning everything at once! Every cell in your body is constantly running this molecular machinery to stay alive.
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