Problem Set I 2010 - Problem Set I: Respiratory Gas...

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Problem Set I: Respiratory Gas Exchange 1) The following data have been reported for a water-breathing aquatic salamander, Siren intermedia . Body mass: 13.7 grams Rate of oxygen consumption: 452 μL O 2 per hour Total surface area of skin: 57.53 cm 2 Partial pressure of oxygen in water: 110 mm Hg Partial pressure of oxygen in blood vessels of skin: 25 mm Hg Skin thickness (assumed diffusion distance to blood capillaries): 100 μm Temperature: 20 ° C a. What is the gradient of P O2 across the skin of the salamander? Assume the difference in oxygen between water and blood is a steady state condition. In essence, you are calculating the conductance (diffusing capacity) of skin for oxygen in area-specific units. c. Estimate Krogh’s diffusion constant for the skin of this animal and compare it to the values for various materials listed below. Note the data below are in units of cm 3 O 2 / (min cm 2 atm cm -1 ), which equals: cm 2 O 2 min -1 atm -1 . water
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Problem Set I 2010 - Problem Set I: Respiratory Gas...

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