EMBRYOLOGY
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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inspiratory capacity
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functional residual capacity
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vital capacity
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total lung capacity
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Detailed explanation-1: -It is the total amount of air exhaled after maximal inhalation. The value is about 4800mL and it varies according to age and body size. It is calculated by summing tidal volume, inspiratory reserve volume, and expiratory reserve volume.
Detailed explanation-2: -The gas volume in the lung after a maximum inspiration is called thetotal lung capacity (TLC; usually 6 to 8 L). TLC can be increased in COPD either by overexpansion of alveoli or by destruction of the alveolar wall, resulting in loss of elastic tissue, as in emphysema (seeFig. 13.4).
Detailed explanation-3: -Tidal volume (TV) measures the amount of air that is inspired and expired during a normal breath. On average, this volume is around one-half liter, which is a little less than the capacity of a 20-ounce drink bottle.