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In respiratory physiology, ventilation is the movement of air between the environment and the lungs via inhalation and exhalation. Thus, for organisms with lungs, it is synonymous with breathing. Ventilation usually happens in a rhythmic pattern, and the frequency of that pattern is called the ventilation rate (or, by long-standing convention, the respiratory rate, although in precise usage ''ventilation'' is a hyponym, not a synonym, of ''respiration''). Ventilation volumes and rates are categorized under the following definitions: _A || = (tidal volume - dead space) * respiratory rate 〔 || the volume of gas per unit time that reaches the alveoli, the respiratory portions of the lungs where gas exchange occurs. |- | ''Dead space ventilation'' || || = dead space * respiratory rate || is the volume of gas per unit time that does not reach these respiratory portions, but instead remains in the airways (trachea, bronchi, etc.). |} ==Sample values== Pulmonary ventilation may be evaluated using a breathing tube or spirometer, measuring the movement of the chest and abdominal walls using respiratory inductance plethysmography or by isolating the subject in an enclosed metabolic chamber (body plethysmography). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ventilation (physiology)」の詳細全文を読む スポンサード リンク
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