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Cardiopulmonary A&P
Diffusion 2b
| Question | Answer |
|---|---|
| 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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