Which of the following is FALSE concerning the relationships of the variables in

Question

Which of the following is FALSE concerning the relationships of the variables in diffusion of O2 across a membrane: 52. (a) doubling the thickness of the membrane would cut the total flow of O2 in half (b) doubling the area of the membrane would double the total flow of O2 (c) if you increased the alveolar concentration of O2 you would increase the total flow of O2 across the alveolar membrane (d) the lower the diffusion coefficient, the higher the total flow e increasing the arterial concentration of O2 would decrease the total flow of O2 53. If the FiO2 is 0.21, the FEO2 is 0.16, the VTis 0.5 L, and the frequency of breathing is 10 min. What is the oxygen consumption: (a) (b) (c) (d) (e) 3.0L min 0.75 L min 2.5 L min 0.3 L min 0.25 L min -1

Explanation / Answer

52. d is false. Diffusion coefficient and oxygen flow are directly proportional. If diffusion coefficient is small then flow will decrease. Diffusion is directly proportional to area of membrane, alveolar and arteriolar concentration and inversely proportional to thickness.

53. Oxygen consumption = Vt * frequency * ( FiO2 - FeO2)

= 0.5 * 10 * ( 0.21 - 0.16)

= 0.25 L / min

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