Anatomy and Physiology

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 …

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