Complete the description of inhalation & exhalation by filling in the blank with the word from the parenthesis

When the diaphragm muscle a inside the lungs Air(lower higher) (lower higher) a air Increase the size of the chest cavity, thus there are more space and less air pressure (relax,contracts), the ribs move up and moves in from the outside where there is air pressure to the lungs where there is pressure This process is called (inhalation, exhalation) (inhale, exhale), the diaphragm muscle ( relaxes, contracts) The diaphragm and ribs return to their original place. The chest cavity returns to its original size. There is now less space and (lower,greater) air pressure inside the lungs. It pushes the air (outside, inside) where there is (higher, lower) air pressure. When you 1. Describe internal & external respiration in terms of the direction of movement of gases (oxygen & carbon dioxide) and the site of occurrence of exchange of gases.​