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Cardiopulmonary A&P

Diffusion 2b

QuestionAnswer
Define diffusion: the movement of gases from an area of HIGH concentration of gas to one of LOW concentration. diffusion continues until all gases in the two areas are in equilibrium.
The __________________________ describes the behavior of gases surrounding the earth. barometric
Boyle’s Law states that at a constant temp, pressure and volume are INVERSELY related
Charles’ Law states that at a constant pressure, volume and temp are DIRECTLY related
Gay-Lussac’s Law states that at a constant volume, pressure is DIRECTLY proportional to temp.
Dalton’s Law states that the total pressure exerted by a mixture of gases is equal to the sum of individual gases
At body temperature, alveolar gas has an absolute humidity of ______________ and a water vapor pressure of _________________________. 37*C or 98.6*F & 20*C
Write the Ideal Alveolar Gas Equation. PAO2 = (PB - PH20)*FiO2 - PACO2 x 1.25
Venous blood entering the alveolar capillary has an oxygen pressure of __________ (PvO2) and a carbon dioxide pressure of_____________ (PvCO2). 40 mm Hg & 46 mm Hg
We know that the PAO2 (the oxygen pressure inside the alveolus) is ______________ and the PACO2 (the carbon dioxide pressure inside the alveolus) is _________________. 100 mm Hg & 40 mm Hg
Therefore, under normal circumstances, when venous blood enters the alveolar-capillary system, there is an oxygen pressure gradient of about _______________ and a carbon dioxide pressure gradient of about ________________.
Diffusion continues until the gases reach ____________________. This is usually accomplished in about ______________ seconds equilibrium & 0.25 seconds
The total transit time for blood to move through the alveolar-capillary system is about_______________ seconds. Therefore, diffusion is complete in about _______________ of the time available. 0.75 & 1/3
The diffusion constants are determined by ________________ and ___________________ Laws. Henrys / Grahams
By combining the two laws, we find the D = _____ divided by _________. S / GMW
According to Fick’s Law, as thickness decreases, gas diffusion { increases decreases }
As the pressure gradient increases, gas diffusion { increases decreases }.
As surface area decreases, gas diffusion { increases decreases }
Define perfusion-limited: _ the transfer of gas across alveolar wall is function of the amount of blood that flows past alveoli.
Define diffusion-limited: the movement of gas across the alveolar wall is function of the integrity of the A-C membrane itself. (how fast gas diffuses across membrane)
Under normal circumstances, the diffusion of oxygen is:
Created by: asiap23
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