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Physiology

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Respiration

Question
2 out of 16
 

Reason for fast CO2 diffusion in blood (AIIMS NOV 2010)



A Less dense

B More soluble in plasma

C Less molecular weight

D Less pco2 in the alveoli

Ans. B More soluble in plasma(Ref: Ganong - 23rd Page-609)

Definition:The diffusion capacity of the lung (DL)is defined as the volume of gas diffusing across the respiratory membrane in 1 minute when the pressure gradient is 1 mmHg.

1. FICK’S LAW

DL = K .A .S

d . MW

Where k is proportionality constant

A = Area of the membrane

S = Solubility of the gas

MW = molecular weight of the gas

D = thickness of the membrane

S

MW is called the diffusion coefficient; the diffusion coefficient is entirely based on the characteristic of the gas.

DLO2 = 25 mL/ min / mm Hg

DLCO2 is 20 times DLO2 asCO2 is more soluble than O2

Respiration Flashcard List

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