The energy released in respiration is used to synthesize molecules that act as a chemical storage of this energy. Organisms that use oxygen as a final electron acceptor in respiration are described as aerobic, while those that do not are referred to as anaerobic. There are organisms, however, that can respire using other organic molecules as electron acceptors instead of oxygen. The reactions involved in respiration are catabolic reactions in metabolism.įuel molecules commonly used by cells in respiration include glucose, amino acids and fatty acids, and a common oxidizing agent ( electron acceptor) is molecular oxygen (O 2). Energy is released by the oxidation of fuel molecules and is stored as "high-energy" carriers. Cellular respiration describes the metabolic reactions and processes that take place in a cell or across the cell membrane to obtain biochemical energy from fuel molecules and the release of the cells' waste products.
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