Experiment to understand the mechanism of breathing
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The process of exchange of oxygen from the atmosphere with carbon dioxide produced by the cells is called breathing. The process of breathing involves two phases:
(1) Inhalation/ Inspiration - When atmospheric air is drawn in and it reaches the lungs then the ribs and sternum raises, the volume of the thorax increases and diaphragm contracts.
(2) Exhalation/ Expiration - When the alveolar air is released out, ribs and sternum return to their original position, the volume of the thorax decreases and diaphragm relaxes and arches upwards
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