AP BIOLOGY

Detailed explanation-1: -Answer. Answer: Compared with atmospheric air, air breathed out by a human contains. A less water vapour, less carbon dioxide.

Detailed explanation-2: -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.

Detailed explanation-3: -Water is formed when sugar (food) is broken by oxygen in respiration (along with carbon dioxide). As a result, exhaled air has significantly more water vapour than inhaled air.

Detailed explanation-4: -In the human body, carbon dioxide is formed intracellularly as a byproduct of metabolism. CO2 is transported in the bloodstream to the lungs where it is ultimately removed from the body through exhalation.

Detailed explanation-5: -Breathe in oxygen, Breathe out… And when you breathe out (exhale), your lungs put carbon dioxide back into the air. However, the breath you exhale doesn’t only contain carbon dioxide. It also contains moisture from your mouth and lungs. This moisture is in the form of water vapor, the gas form of water.