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The process of breathing (respiration) is divided into two distinct phases, inspiration (inhalation) and expiration (exhalation). During inspiration, the diaphragm contracts and pulls downward while the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs. During expiration, the diaphragm relaxes, and the volume of the thoracic cavity decreases, while the pressure within it increases. As a result, the lungs contract and air is forced out. Review Date 8/22/2016
1 the intercostal muscles contract, expanding the ribcage. 2  the diaphragm contracts, pulling downwards to increase the volume of the chest. 3  pressure inside the chest is lowered and air is sucked into the lungs.hen you inhale inhale: breathe air in 1  : the intercostal muscles contract, expanding the ribcage. 2  the diaphragm contracts, pulling downwards to increase the volume of the chest. 3  pressure inside the chest is lowered and air is sucked into the lungs.