In this article, we can Differentiate between inhalation and exhalation of Class 10 Science Chapter Life Processes with a full detailed explanation
Inspiration or Inhalation: It is bringing of fresh air into lungs for exchange of gases. During inhalation. thoracic cavity enlarges due to two types of inspiratory muscles, phrenic and external intercostals, Phrenic muscles straighten the diaphragm by moving its curved part downwards. It increases the length of thorax.
Expiration or Exhalation: It is throwing out or expulsion of foul air from the lungs after an exchange of gases. Expiration or exhalation is a passive is a passive process caused by relaxation of inspiratory muscles. Relaxation of phrenic muscles causes the diaphragm to become dome-shaped and bulge into the thorax. It results in shortening of thoracic cavity. Relaxation of external intercostal muscles pulls the rib cage inwardly and downwardly. It results the girth of thorax.
Difference Between Inhalation and Exhalation
| Inhalation/Inspiration | Exhalation/Expiration | |
|---|---|---|
| 1 | Action: Inhalation is bringing in of fresh air from outside | It is passing out of foul air to the outside |
| 2 | Rib Cage: It is pushed outwardly and upwardly | It is pulled inwardly and downwardly |
| 3 | Diaphragm: It contracts and become nearly flat | It relaxes and becomes dome-shaped |
| 4 | Thoracic Cavity: It increases in size | It decreases in size |
| 5 | Air Pressure: Air Pressure decreases in lungs | There is increase in air pressure in the lungs |
| 7 | Types of Process: Inhalation is an active process | Exhalation is a passive process |
| 4 | Result: Air Rushes from outside and causes inflation of lungs | Air is expelled from lungs causing their deflation |
| 5 | Oxygen: Inhaled air has an oxygen concentration of 20.84% | Exhaled air has an oxygen concentration of 15.7% |
| 7 | Carbon Dioxide: Its concentration in inhaled air is 0.04% | Its concentration in exhaled air is 4.0% |