MICROANATOMY

Detailed explanation-1: -The composition of environmental air is approximately 78% nitrogen, 21% oxygen, 1% argon, and trace percentages of other gases, such as carbon dioxide, neon, methane, helium, krypton, hydrogen, xenon, ozone, nitrogen dioxide, iodine, carbon monoxide, and ammonia.

Detailed explanation-2: -Inhaled air is a mixture of different gases present in the atmosphere. It contains around 78% nitrogen, 21% oxygen, 0.04% of carbon dioxide and other gases.

Detailed explanation-3: -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-4: -Inhaled atmospheric gas is 21% oxygen. The amount of oxygen inhaled, i.e., FiO2 is not equivalent to the oxygen which participates in gas exchange at the alveolar level.

Detailed explanation-5: -Oxygen is essential for life. Normal air contains 21% oxygen, which we breathe into our lungs so it can enter our bloodstream to help with the proper functioning of our tissues and organs. We also breathe as a way to expel carbon dioxide gas, which is a type of waste our bodies produce.