Question

1. approximately what percentage of oxygen is contained in exhaled air?

o 80%
o 17%
o 99%
o 2%

Explanation:

Inhaled air is about 21% oxygen. During respiration, the body uses some oxygen. Exhaled air contains approximately 17% oxygen as some oxygen is absorbed by the body for cellular - respiration and carbon - dioxide is added to the air.

Answer:

17%