Respiration

Respiration may refer to:

breathing
Respiratory system, the anatomical system of an organism used for respiration
Cellular respiration, the process in which nutrients are converted into useful energy in a cell
Respiration (physiology) and breathing, the physiological process that enables animals to exchange carbon dioxide, the primary product of cellular respiration, for fresh air
Anaerobic respiration, cellular respiration without oxygen
Aquatic respiration, the process of animals extracting oxygen from water
Maintenance respiration, the amount of cellular respiration required for an organism to maintain itself in a constant state
Artificial respiration, the act of simulating respiration, which provides for the overall exchange of gases in the body by pulmonary ventilation, external respiration and internal respiration
Cheyne-Stokes respiration, an abnormal pattern of breathing characterized by progressively deeper and sometimes faster breathing, followed by a gradual decrease that results in a temporary stop in breathing called an apnea

Carbon respiration, a concept used in calculating carbon (as CO₂) flux occurring in the atmosphere
Ecosystem respiration, measure of gross carbon dioxide production by all organisms in an ecosystem
Root respiration, exchange of gases between plant roots and the atmosphere
Photorespiration, the process by which RuBP (a sugar) has oxygen added to it by the main enzyme involved in photosynthesis, rubisco, instead of carbon dioxide as happens during photosynthesis