Wize University Biology Textbook > Cellular Respiration
Overview of Cellular Respiration
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Overview of Cellular Respiration
Cellular respiration is a set of catabolic reactions that allows organisms to convert biochemical energy from nutrients into ATP. Aerobic (meaning, in the presence of oxygen) cellular respiration can be broken down into 4 stages:
- Glycolysis
- Pyruvate processing / oxidation
- Citric acid cycle / Kreb’s cycle / tricarboxylic acid (TCA) cycle
- Electron transport chain (ETC) and ATP synthesis
Molecules that can store energy
- ATP - energy carried via a phosphate group
- NADH or NADPH - energy carried via electrons and hydrogen
- FADH2 - energy carried via electrons and hydrogen
There are two types of cellular respiration: aerobic respiration (requires oxygen; redox reaction) and anaerobic respiration (does not require oxygen).
