explain role of diaphragm in respiration

Dear student

The diaphragm is an thin muscular sheet that forms the floor of the chest cavity. The up and down movement of the diaphragm causes a change in the size of the chest cavity that is very important for breathing.

The breathing involves two processes: Inhalation and exhalation. 
During inhalation, the diaphragm moves down and the ribs move upwards and outwards, thereby increasing the space in the chest cavity. This leads to the movement of air inside the lungs.
During exhalation, the diaphragm moves to its former position and the ribs move downwards and inwards, thereby reducing the size of the chest cavity. This leads to the movement of air out of the lungs.

Regards

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