aerobic respiration

Aerobic respiration is a biological process where organisms combine oxygen with food molecules to release chemical energy. This energy is then converted into adenosine triphosphate (ATP), the cell's primary energy currency, which fuels its activities. Waste products of this process include carbon dioxide and water.

The process occurs in three main stages:
* Glycolysis: A glucose molecule is broken down into two pyruvate molecules, with some energy captured as ATP.
* Tricarboxylic acid cycle (TCA cycle): Pyruvate is further processed, releasing more energy captured by NAD+ and FAD, and producing carbon dioxide as waste.
* Oxidative phosphorylation: Electrons from NADH and FADH2 are passed along a chain of molecules, ultimately reducing oxygen to water. This process generates the majority of ATP.

In eukaryotic cells, these stages primarily occur within mitochondria, while in microorganisms, the enzymes are part of the cell membrane.123