Why is the total mechanical work of breathing difficult to assess during spontaneous breathing?
a. Most volunteer subjects cannot under-stand the procedure used.
b. Respiratory muscle activity contributes to inflation resistance.
c. The respiratory muscles (diaphragm, etc.) must be paralyzed.
d. The subjects used to make the measure-ments must be unconscious.
ANS: B
The mechanical work of breathing cannot be measured easily during spontaneous breathing. This is because the respiratory muscles contribute to the resistance offered by the chest wall.
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