Respiration - GCSE Biology Definition

Respiration is a vital process that occurs in every living cell, where energy is released from glucose so that the cell can carry out its functions. In GCSE Biology, you learn that there are two types of respiration: aerobic and anaerobic. Aerobic respiration uses oxygen and produces carbon dioxide, water, and a large amount of energy. It occurs when we are breathing normally and is how our bodies generate most of their energy. Anaerobic respiration does not use oxygen and takes place when the body needs a quick burst of energy, such as during intense exercise. It produces less energy and causes lactic acid to build up, which can make muscles feel sore.