MICROANATOMY

Detailed explanation-1: -By composition, dry air contains approximately 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Oxygen is approximated to be 21% because it’s actual value leans closer to 21%.

Detailed explanation-2: -True. 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-3: -We inhale: nitrogen – 78% oxygen-21% other gases – 1%

Detailed explanation-4: -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. This is because our cells use oxygen from the inhaled air to release energy and give out carbon dioxide as a byproduct.

Detailed explanation-5: -The atmospheric air consists of 78% of nitrogen, 21% of oxygen, 0.04% of carbon dioxide and 0.93% of argon and other inert gases.