When we breath in the intercostal muscles and the diaphramcontract. This means the diaphramflattens & the rib cage & sternummove up and out. This makes the volume of the thoraxincrease in size which causes a decrease in pressure. Air is then drawn into the lungs
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breathing out
Breathing out occurs when the intercostal muscles & the diaphramrises. This means that the ribs and Sternum move in and down, as a result the volume of the thoraxdecreases and the pressureincreases meaning that the air is forced out of the lungs.
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