Upper level: b449 Functions of the respiratory system, other specified and unspecified
Functions of inhaling air into the lungs, the exchange of gases between air and blood, and exhaling air.
Inclusions: functions of respiration rate, rhythm and depth; impairments such as apnoea, hyperventilation, irregular respiration, paradoxical respiration, and brochial spasm, and as in pulmonary emphysema
Exclusions: respiratory muscle functions (b445); additional respiratory functions (b450); exercise tolerance functions (b455)
Lower livel: