Aerobic as applied to
http://www.answers.com/topic/metabolism-6 in cells of the body, or in microorganisms, means
oxygen-utilizing. Aerobic metabolism occurs in most animal cells, and depends upon the presence of mitochondria, in which the key chemical processes take place. Aerobic bacteria inhabit the body surface and orifices - they do not have mitochondria. Aerobic exercise is that which is sustainable in balance with oxygen intake - for example, a 10 km race, or any milder rhythmic exercise.