Notes in ✧ Gas Exchange

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Status	Last Update	Fields
Published	01/14/2024	The partial pressure of a gas (Px) in humidified tracheal air is equal to {{c1::(PB - PH2O) * F::equation}}
Published	01/14/2024	The partial pressure of a gas (Px) in dry expired air is equal to {{c1::PB * F::equation}}
Published	01/14/2024	The concentration of a dissolved gas (Cx) is equal to {{c1::Px * Solubility}}
Published	01/14/2024	Transfer of gases across cell membranes or capillary walls occurs by {{c1::simple diffusion}}
Published	01/14/2024	According to Fick's law, the rate of diffusion of a gas (Vgas) is equal to: {{c1::}}
Published	01/14/2024	The diffusion coefficient (DK) for CO2 is approximately 20x {{c1::higher}} than that of O2
Published	01/14/2024	The lung diffusing capacity (DL) is the equivalent of {{c1::permeability}} of the alveolar-pulmonary capillary barrier
Published	01/14/2024	The lung diffusing capacity (DL) can be measured with {{c1::carbon monoxide (CO)}} because it is exclusively diffusion-limited
Published	01/14/2024	DLCO may be used to estimate the extent to which {{c1::oxygen}} passes from the air sacs of lungs into blood
Published	01/14/2024	The lung diffusing capacity, DL, is {{c1::directly}} proportional to the surface area available for diffusion
Published	01/14/2024	The lung diffusing capacity, DL, is {{c1::directly}} proportional to the diffusion coefficient of the gas
Published	01/14/2024	The lung diffusing capacity, DL, is {{c1::inversely}} proportional to the alveolar wall thickness
Published	01/14/2024	The lung diffusing capacity, DL, {{c1::decreases}} in emphysema due to decreased {{c2::surface area (A)}}
Published	01/14/2024	The lung diffusing capacity, DL, {{c1::decreases}} in pulmonary fibrosis due to increased {{c2::wall thickness (Δx)}}
Published	01/14/2024	The lung diffusing capacity, DL, {{c1::increases}} during exercise due to increased {{c2::surface area (A)}}
Published	01/14/2024	The Po2 in dry inspired air is normally approximately {{c1::160}} mmHg
Published	01/14/2024	The Po2 in humidified tracheal air is normally approximately {{c1::150}} mmHg
Published	01/14/2024	The partial pressure of oxygen in the alveolar air (PAO2) and arterial blood (PaO2) is normally approximately {{c1::100}} mmHg
Published	01/14/2024	The partial pressure of carbon dioxide in the alveolar air (PACO2) and arterial blood (PaCO2) is normally approximately {{c1::40}} mmHg
Published	01/14/2024	The partial pressure of oxygen in the venous blood (PvO2) is normally approximately {{c1::40}} mmHg
Published	01/14/2024	The partial pressure of carbon dioxide in mixed venous blood (PvCO2) is normally approximately {{c1::46}} mmHg
Published	01/14/2024	The partial pressure of O2 in arteriolar blood is slightly {{c1::lower}} than alveolar air due to the "{{c2::physiologic shunt}}"
Published	01/14/2024	The two sources of the physiologic shunt are {{c1::bronchial}} blood flow and a small portion of {{c2::coronary}} venous blood (drains into the left v…
Published	01/14/2024	The total gas concentration in solution is the sum of the {{c1::dissolved}} gas plus {{c2::bound}} gas plus {{c3::chemically}} modified gas
Published	01/14/2024	The {{c1::partial pressure}} gradient is the driving force for the diffusion of a gas
Published	01/14/2024	Only {{c1::free, dissolved}} gas contributes to the partial pressure of a gas in solution
Published	01/14/2024	In {{c1::diffusion}}-limited gas exchange, the gas does not equilibrate by the time blood reaches the end of the capillary
Published	01/14/2024	In {{c1::perfusion}}-limited gas exchange, the gas equilibrates early along the length of the capillary
Published	01/14/2024	In {{c2::perfusion}}-limited gas exchange, diffusion can be increased only if {{c1::blood flow}} increases
Published	01/14/2024	In normal health, O2 exhibits {{c1::perfusion}}-limited gas exchange
Published	01/14/2024	CO2 exhibits {{c1::perfusion}}-limited gas exchange
Published	01/14/2024	N2O exhibits {{c1::perfusion}}-limited gas exchange
Published	01/14/2024	CO exhibits {{c1::diffusion}}-limited gas exchange
Published	01/14/2024	When patients have diseased lung tissue (e.g. fibrosis/emphysema) O2 transfer becomes {{c1::diffusion}}-limited
Published	01/14/2024	At {{c1::high}} altitude the partial pressure gradient of O2 is {{c2::lower}} and thus equilibration takes {{c2::longer}}
Status	Last Update	Fields