Diaphragm moves downward Rib moves upward The volume of the chest cavity increases. The air pressure in the area around the lungs is lower than outside air. Outside air will move into the nose, trachea and lung to
Diaphragm moves lower rib moves higher, the volume of the chest cavity. The air pressure in the lower lung area around than the air outside. The weather outside, it moves into the nose, bronchi and lung air sacs to
The diaphragm will move down the ribs to move up to the capacity of the chest, increased air pressure in the area around it, lung lower than outside air outside air, it moves into the trachea and the nose