AP BIOLOGY

Detailed explanation-1: -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-2: -a) i) Inspired air contains more O2, less CO2, and less water vapor then expired air.-the air in the alveoli is constantly being replaced. b) i) The release of energy by cells without the use of oxygen.

Detailed explanation-3: -nitrogen – 78% oxygen-21% other gases – 1% carbon dioxide – 0.04%.

Detailed explanation-4: -The air that we inhale contains around 21% oxygen. This oxygen is used by the body for respiration and therefore the exhaled has less percentage of oxygen (13.6% to 16%).

Detailed explanation-5: -Answer: The exhaled air contains more carbon dioxide because the carbon dioxide produced during respiration is removed out of the body as the exhaled air during the process of respiration.