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D the lung diffusing capacity d l is a coefficient of

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D. The lung diffusing capacity (DL) is a coefficient of proportionality that dependson the followinga.diffusivity of the gas in the air of the alveolib.diffusivity of the gas in the wall of the alveolic.concentration of the gas in the air of the alveolid.partial pressure of the gas in the air of the alveolie.all of the above
3. Determining maximum muscle contribution to breathing (20 points)Given the following information, determine the maximum force/pressure that can beexerted by patient’s expiratory and inspiratory muscles.CL= 0.2 L/cm H20VTLC= 6 LVRV= 1 LCCW= 0.2 L/cm H20VFRC= 3 LA.(5 points) Determine equations for the lung and chest wall that describe the pressure-volume relationships using the tissue mechanics.B.(5 points) Relate the lung and chest wall at a condition that involves no interaction fromthe muscles.C.(5 points) Determine the muscle pressure (units cm H20) required to reach VTLC. What isthe sign of your result and what does it indicate?D.(5 points) Determine the muscle pressure (units cm H20) required to reach VRV. What isthe sign of your result now, and what does it indicate? Which force has a greatermagnitude?Name: _______________________________________5
4. Water lost from breathing (20 points)In class we performed a steady-state breath-to-breath analysis to determine the nettransport rate for oxygen (in) and carbon dioxide (out) as a function of time. Using a similaranalysis, determining how much water is lost when inhaled air is humidified as it passesthrough the lung tree. For this analysis, assume that the air in the airway tree is well-mixed,and thus all air inhaled is fully humidified to saturation.A.(5 points) Draw a diagram for this problem. Be sure to label the relevant regions ofinterest and the control volume. Label the relevant concentrations of water and transportrates. Hint: think of humidification in the same manner as diffusion.B.(7 points) Perform a mass balance based on your diagram. Remember we areanalyzing what happens over a full breath so you can apply a pseudo-steady stateapproximation. Solve for the rate of water transport in units of moles H20/time.C.(2 points) Convert your answer in part B to units of volume H20/time. You may use adirect analogy from class, or derive for yourself. Hint: remember that the equation will

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Term
Fall
Professor
staff
Tags
chest wall

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