Q: What is the volume of dead space air in the lungs?  

Answer: A

Dead space air is the air that remains in the lungs and does not participate in gas exchange. The volume of dead space air is approximately 150 CC. This air is trapped in the conducting airways such as the trachea, bronchi and bronchioles, and does not reach the alveoli where gas exchange takes place. This means that during each breath, some of the air that is inhaled does not contribute to the oxygenation of the blood. Dead space air can increase in conditions like chronic obstructive pulmonary disease (COPD) and pulmonary embolism, and can decrease with exercise and positive pressure ventilation.

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