Explain why ,exhaled air containsless oxygen than inhaled air

Oxygen in expired air

the partial pressure of oxygen in the alveolar air is

Mark the following statements as True or False. Correc the false statements Exhaled air has more percentage of CO_(2) than inhaled air.

Alveolar air has more/less oxygen than atmospheric air.

A person takes 15 breaths per minute. The volume of air inhaled in each breath is 448 ml and contains 21% of oxygen by volume. The exhaled air contains 16% of oxygen by volume. If all the oxygen is used in the combustion of sucrose, how much of the Sucrose is burnt in the body per day & how much heat is evolved. Delta H_(com) of sucrose is = 6000 kJ mol^(-1) . Take temperature to be 300 K throughout. [Assuming V_("inhaled air") = V_("exhalded air"), P_(atm) = 1atm ]

The alveolar air has less oxygen but more CO_(2) than inspired air.