Cellular respiration, the process in which nutrients are converted into useful energy in a cell
Anaerobic respiration, cellular respiration without oxygen
Maintenance respiration, the amount of cellular respiration required for an organism to maintain itself in a constant state
Respiration (physiology), transporting oxygen and carbon dioxide between cells and the external environment
Respiratory system, the anatomical system of an organism used for respiration
Breathing, passing air through respiratory organs
Aquatic respiration, animals extracting oxygen from water
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