<unk>  transports oxygen into the body and carbon dioxide out of the body. Aerobic organisms require oxygen to create energy via respiration, in the form of energy-rich molecules such as glucose. The medical term for normal relaxed<unk>  is eupnoea. Organisms breathe to avoid death from asphyxiation.
Breathing
Heart rate
Heart sounds
Cough reflex
Respiratory rate
Respiration 
Itch
Muscle tone