21% of the air we inhale is oxygen
Exhaled air contains 16% oxygen and 21% when inhaled.
yes!
About 21%
About 21%.
oxygen:)
air, which is a mix of several gasses
cells
The percentage of oxygen in inhaled air by humans is approximately 21%. This oxygen is then absorbed by the lungs and transported by the blood to the cells where it is used for energy production in the body.
The hawk is bird not oxygen and the hawk inhaled oxygen and exhaled carbon dioxide.
vein
If you're talking about the level in the air, which I assume you are, it's because as we exhale, the oxygen we inhaled is replaced with carbon dioxide, which trees "breathe" in. Trees, or any plant, then releases oxygen after it completes photosynthesis with the carbon dioxide.
The concentration of oxygen inhaled during oxygen therapy depends on the flow rate of oxygen being delivered and the delivery method used (e.g., nasal cannula, mask). Higher flow rates or different delivery methods can increase the concentration of oxygen being delivered to the patient.