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PEDS200 (38)
Lecture

Gas Exchange

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Department
Physical Education and Sport
Course
PEDS200
Professor
Dan Syrotuik
Semester
Fall

Description
Oct 27 Gas Exchange The BasicsDiffusion random movement of molecules gases tend to diffuse from areas of high concentration to low concentration Partial Pressure P simply the pressure exerted by a gasPartial Pressure of gas is determined by 1 The fractional percent concentration of a gas 2 The atmospheric pressure barometricy Partial pressure P is used to express the pressure of each separate gas in a gas mixture or liquid bloodPO2 at sea level Pb 760 mmHg x fractional concentration of O2 2093 1591 mmHg sea level PCO2 0228 and PN2 600 mmHgWhat about the partial pressure of gases in the alveoli y There is also an addition of water molecules vapour to inspired air which subtract the equivalent of 47 mmHg at body temp y An increase in surface area for gas exchange within lung that also decreases pressure increase in volume decrease in pressure and y A mixture of CO2 higher and O2 lower gases from blood entering pulmonary capillaries y Result in lung PaO2 100105 mmHg and PaCO2 40 mmHg Aalveolar
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