| Inhalation | Exhalation |
| During inhalation, the thoracic cavity (chest cavity) expands. | Thoracic cavity contracts. |
| Ribs lift up. | Ribs move downwards. |
| Diaphragm become flat in shape. | Diaphragm becomes dome-shaped. |
| Volume of lungs increases and air enters the lungs | Volume of lungs decreases and air exits from the lungs. |
