- Exhalation is the process of breathing out carbon (IV) oxide from the respiratory system of a human.
- This commences when external intercostal muscles relaxes.
- This is followed by internal intercostal muscles contracts.
- The diaphragm relaxes and moves outwards.
- The ribs moves outwards and inwards.
- This results to decreases in volume within the thoracic cavity and increasing pressure within the lungs in respect to atmospheric pressure.
- As a result of this,air(carbon dioxide) is drawn out of the lungs of a human down a pressure gradient.
franco crick answered the question on January 22, 2018 at 16:23
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