肺活量是指人尽最大努力吸气后 ,再尽最大努力呼气所能呼出的气体量。它代表人的呼吸系统的最大工作能力。人在最大吸气以后 ,以最快的速度将气体全部呼出 ,前几秒钟内呼出的气体量占肺活量的百分数 ,叫时间肺活量。它可作为肺气肿等诊断和治疗效果评价指标。正常成人第 1、2、 Vital capacity refers to the amount of gas that can be exhaled after humans try their best to inhale and then try their best to exhale. It represents the maximum working capacity of the human respiratory system. After the maximum inhalation, people exhale the gas at the fastest rate, and the amount of gas exhaled in the first few seconds accounts for the percentage of vital capacity, which is called the temporal vital capacity. It can be used as an evaluation indicator for the diagnosis and treatment of emphysema. Normal adults 1, 2