2nd October 2019


What is the difference between inhaled and exhaled air?

The difference between the amount of oxygen in inhaled and exhaled air is equal to the difference in the amount of carbon dioxide in exhaled and inhaled air. The special adaptions of the alveoli for gas exchange are: Thin walls. Huge surface area.

What happens during expiration?

This happens due to elastic properties of the lungs, as well as the internal intercostal muscles that lower the rib cage and decrease thoracic volume. As the thoracic diaphragm relaxes during exhalation it causes the tissue it has depressed to rise superiorly and put pressure on the lungs to expel the air.
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