Inhalation and Exhalation
Here we have compared Differences between Inhalation and Exhalation.
| Inhalation | Exhalation |
| Action. Inhalation is bringing in of fresh air from outside. | It is passing out of foul air to the outside. |
| Rib Cage. It is pushed outwardly and upwardly | It is pulled inwardly and downwardly. |
| Diaphragm. It contracts and becomes nearly flat. | It relaxes and becomes dome-shaped. |
| Thoracic Cavity. It increases in size. | It decreases in size. |
| Air Pressure. Air pressure decreases in lungs. | There is increase in air pressure in the lungs. |
| Respiratory Muscles. They contract to bring about inhalation. | They relax to cause exhalation. |
| Type of Process. Inhalation is an active process. | Exhalation is a passive process. |
| Result. Air rushes from outside and causes inflation of lungs. | Air is expelled from lungs causing their deflation. |
| Oxygen. Inhaled air has an oxygen concentration of 20.84%. | Exhaled air has an oxygen concentration of 15.7%. |
| Carbon Dioxide. Its concentration in inhaled air is 0.04%. | Its concentration in exhaled air is 4.0%. |