How do human breath?
Our lungs have no muscles. Two type of muscles work during breathing process ; the intercostal muscles of ribs, and the dome-shaped diaphragm. the process of breathing is completed two steps:
1- Inhaling
2- Exhaling
Inhaling:
When the intercostal muscles pull our ribs outward and the diaphragm contracts, the air enters the lungs. it is called inhaling.
Exhaling:
When the intercostal muscles and diaphragm muscles relax, the air moves out of the lungs. it is called exhaling.
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