BREATHING MECHANISM

Our body takes in oxygen and gives off carbon dioxide and water vapour during respiration process.

INHALATION

During inhalation

1. The ribcage moves upwards and outwards.
2. The diaphragm flatten and contracts.
3. Air from outside enters into the lungs.
4. The volume in thoracic cavity increases.
5. The air pressure in thoracic cavity decreases.

EXHALATION

During exhalation:

1. The ribcage moves downwards and inwards.
2. The diaphragm flatten and curves upwards.
3. The air pressure in te thoracic increases.
4. The volume in the thoracic cavity decreases.
5. The air is forced out of the lungs.