One of the functions of respiration is powering of the speech production mechanism. It provides energy source for oral communication. When the volume of the chest cavity increases/expands, air is inhaled into the lungs by the way of either the mouth or nose and trachea. An increase in the volume of the chest may be affected through a downward, contracting movement of the diaphragm; through an upward, outward movement of the lower ribs; or …showed first 75 words of 3521 total…

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