What is the percentage of O 2 in inspired air at sea level and at 10, 000 ft height?

The air taken from the atmosphere during inspiration is called inspired air. It contains more oxygen in comparison to expired air and the alveolar air. At sea level, the percentage of oxygen is 20.84%, i.e., 21%. At a high altitude of about 10,000 ft height, the percentage of oxygen decreases to about 50%, i.e., 50% of 21% that is about 10.5%.

What is the percentage of O 2 in expired air?

During expiration, the air given out by the lungs is called expired air. It is formed by the combination of dead space air and alveoli. In comparison with alveolar air, it contains more oxygen and less carbon dioxide. The percentage of oxygen in expired air is 15.3%.

What is the percentage of O 2 in alveolar air?

The amount of air that is present in the respiratory part of the lungs and takes part in a gaseous exchange with the blood of pulmonary capillaries is known as alveolar air. The percentage of oxygen in alveolar air is 13.2%.