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B
Trachea
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C
Bronchus
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D
Alveoli
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Solution
The correct option is D Alveoli All the air in each breath is not available for the exchange of oxygen and carbon dioxide. Dead space (residual air) is the volume of air which is inhaled that does not take part in the gas exchange, either because it remains in the conducting airways, or reaches alveoli that are not perfused or poorly perfused. This residual air that remains in the lungs is seen in alveloi.