ANIMAL PHYSIOLOGY
GAS EXCHANGE IN HUMANS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
oxygen 16%, carbon dioxide 4%
|
|
|
oxygen 16%, carbon dioxide 8%
|
|
|
oxygen 20%, carbon dioxide 0.04%
|
|
|
oxygen 20%, carbon dioxide 4%
|
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.
Detailed explanation-2: -Composition of air is: Nitrogen-78% Oxygen-21% Carbon dioxide-0.03 %
Detailed explanation-3: -The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of other gases, too, such as carbon dioxide, neon, and hydrogen.
Detailed explanation-4: -It occupies almost 21% of the total gases in the atmosphere. Argon, carbon dioxide and many other gases form the remaining 1%. Carbon occupies about 0.03% of the earth’s atmosphere. Nowadays, the level of carbon-dioxide increases due to the burning of fossil fuels, deforestation, etc.
Detailed explanation-5: -So how did Earth end up with an atmosphere made up of roughly 21 percent of the stuff? The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen.