Question

. Exhaled air contains 21% Oxygen.
True
False

Answer 1

false,, most of oxygen is taken in by blood,

Answer 2

True

When we exhale, the composition of the air remains almost the same as the air we inhale, only the percentage of carbon dioxide and oxygen changes. The amount of inhaled air contains 21% of oxygen and 0.04% of carbon dioxide, while the air we breathe out contains 16.4% of oxygen and 4.4% of carbon dioxide.