The work of breathing normally requires about 3% of total energy expenditure; this increases under all of the following situations except when:
A) Elastic recoil is decreased.
B) Resistance goes up.
C) The partial pressure of oxygen increases in the air.
D) Ventilation must be increased.
E) Compliance is decreased.

Question

Quizplus · Accepted Answer

The work of breathing increases under all of the listed situations except when the partial pressure of oxygen increases in the air. This is because when there is more oxygen available, the body does not have to work as hard to extract it from the air.

The Work of Breathing Normally Requires About 3% of Total