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Breathing

Mechanism of Breathing
by

Zak Garofolo

on 20 November 2012

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Transcript of Breathing

Mechanism of Breathing Some Principles of Breathing: Air moves into and out of the lungs bcs of a pressure difference.
Air moves down its pressure gradient (from high pressure to low pressure)
Boyle's Law: Volume and Pressure are inversely related (i.e., as one increases, the other decreases). Atmospheric Pressure = 760 mm Hg Alveolar Pressure
= 760 mm Hg Intrapleural Pressure
= 758 mm Hg INSPIRATION Increased volume of thoracic cavity
Decreased alveolar pressure
Air moves down its gradient from high (outside) to low (inside): air rushes in Atmospheric Pressure = 760 mm Hg Alveolar Pressure
= 759 mm Hg Intrapleural Pressure
= 756 mm Hg sternocleidomastoid pectoralis minor external intercostal muscles diaphragm contracts
downward Rib cage and sternum
moves up and
outward EXPIRATION Diaphragm and inspiratory muscles relax
Forced expiratory muscles: internal intercostal muscles + abdominal muscles Atmospheric Pressure = 760 mm Hg Alveolar Pressure
= 761 mm Hg In b/w expiration and inspiration: no air movement In b/w inspiration and expiration: no air movement Alveolar Pressure= 760 mm Hg Intrapleural Pressure
= 754 mm Hg Intrapleural Pressure
= 756 mm Hg Atmospheric Pressure = 760 mm Hg Decreased volume of thoracic cavity
Increased alveolar pressure
Air moves down its gradient from high (inside) to low (outside): air rushes out http://prezi.com/wmtpl2adl7jd/breathing/
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