Inhalation & exhalation

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BREATHING/VENTILATION: the process of moving air in (inhalation) and out (exhalation) of the lungs.- ventilation is made possible by action of muscles.: diaphragm & intercoastal muscles

diaphragm - contracts/flattens
intercoastal muscles - contract
rib cage - moves upward & outward
volume of chest cavity - increases
Pressure of chest cavity - decreases
air movement - forced inside lungs

diaphragm - relaxes/becomes dome shaped
intercoastal muscles 


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