Question

The volume of ‘anatomical dead space’ air is normally

• A. 230 mL
• B. 210 mL
• C. 190 mL
• D. 150 mL

Answer 1

The correct option is D 150 mL

'Anatomic dead space' is the total volume of air in the conducting airways from the nose or mouth down to the terminal bronchioles.
This air does not take part in the gas exchange, because it remains in the conducting airways. In other words, not all the air in each breath is available for the exchange of oxygen and carbon dioxide. The volume is about 150 ml on the average in humans.