Measurements of cells from a gorilla show that, after hard exercise, the gorilla has less of ATP in its cells. ATP is the energy coin of the cells.
Cellular respiration is a group of metabolic reactions by which aerobic cells can produce ATP by using the energy stored in the chemical bonds of foods and oxygen.
Cellular respiration has three main stages: glycolysis (occurs in the cytoplasm), the Krebs cycle and oxidative phosphorylation (these last two pathways occur in the mitochondria).
In oxygen deprivation conditions, muscle cells can also produce ATP by acid lactic fermentation.
Acid lactic fermentation is less efficient in terms of ATP production than cellular respiration.
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