BIOL 031 Lecture Notes - Lecture 27: Vital Capacity, Exhalation, Spirometer
17 Sep 2020
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Document Summary
Gasses are exchanged with the external environment via the lungs. The airways: conduction of air from outside to alveoli. Conducting system is everything down to part way through the bronchioles. The exchange surface is predominantly the alveoli, and some of the bronchioles. Inspiration: the act of drawing air into the lungs. Expiration: the act of drawing air outside the lungs. Capacities are the sum of two or more volumes. Tidal volume: tidal volume (symbol vt or tv) is the lung volume representing the normal volume of air displaced between normal inhalation and exhalation when extra effort is not applied. In a healthy, young human adult, tidal volume is approximately 500 ml per inspiration or 7 ml/kg of body mass. Inspiratory reserve volume: about 3,100 ml, is the additional air that can be forcibly inhaled after the inspiration of a normal tidal volume. Inspiratory capacity: is the amount of air that can be inhaled after the end of a normal expiration.
