Midterm_2015_solution.pdf - ! ! ! BME 121 ! Quantitative...

BME 121
Quantitative Physiology: Organ Transport Systems
Midterm Exam
Winter 2015
February 12th
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1

1. True or False with short answer justification (20 points, 4 points each)
Read each question carefully, answer true or false (1 point), AND justify answer in 1-2
sentences (3 points)
A. The lung diffusing capacity (D
L
) for a gas such as oxygen is a “lumped” parameter
describing the conductance out of the lungs, and depends ONLY on the properties of
the airway wall.
B. Lung recoil can primarily be attributed to alveolar surface tension whether surfactant is
present or not.
C. In the lung airways, air is heated and humidified to saturation. The addition of a new
partial pressure from water vapor (P
H20,sat
) results in increased total pressure and a
resulting increase in the partial pressures for the other gases (since partial pressure P
i
=
n
i
P).