The lungs can be expanded & contracted in two ways; By downward and upward movement of the diaphragm to lengthen or shorten. By elevation and depression of the ribs to increase and decrease the...
The diaphragm separates the thoracic cavity, containing the heart & lungs, from the abdominal cavity, It is the primary muscle used in respiration, It has some nonrespiratory functions as well, The diaphragm increases the...
