1431cv15 - • Expiration -predominantly passive –...

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15 Breathing (ventilation) • Air molecules move from an area of higher pressure to an area of lower pressure • Inspiration - diaphragm and external intercostals contract – increase volume in thoracic cavity – reduce pressure in lungs – air flows in
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Unformatted text preview: • Expiration -predominantly passive – relaxation of inspiratory muscles – decrease volume of cavity – air pressure higher in lungs – air moves out – heavy exercise - abdominal ms and internal intercostals aid in expiration...
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This note was uploaded on 12/26/2011 for the course KIN 143 taught by Professor Asmundson during the Fall '09 term at Simon Fraser.

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