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What is Metabolism?
Humans consume food in order to generate energy for all the body’s processes. Metabolism includes all the chemical reactions that take place in the body’s cells related to consuming, generating, and using energy.
One metabolic pathway (a series of chemical reactions) is called cellular respiration, which is the conversion of sugar (glucose) into energy (a molecule called adenosine triphosphate or ATP). Cellular respiration occurs in the mitochondria of all body cells.
Figure 4. Animal cell with nucleus and mitochondria labeled
Adapted from Simple plant and animal cell comparison; Tomas Kebert; CC BY-SA 4.0; https://commons.wikimedia.org/wiki/File:Simple_plant_and_animal_cell.svg
Figure 5. Mitochondria
Transmission electron microscope image of a thin section cut through an area of mammalian lung tissue. The high magnification image shows a mitochondria; Louisa Howard; Public domain; https://commons.wikimedia.org/wiki/File:Mitochondria,_mammalian_lung_-_TEM_(2).jpg
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