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# EXAM 3 - 80 70 60 Po2 O 70 0 10 20 Per cent age 602 Hat...

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Percentage O 2 saturation Po 2 (mm Hg) 80 70 60 50 40 30 20 10 0 10 20 30 40 50 60 70 80 90 100 EXAM 3 Biol 350: 11-30-2010 Name: _________________________________ ID: ______________________ 1. In one sentence, define the partial pressure of a gas in a mixture of gases. 2. The atmospheric pressure of air at sea level is 760 mm Hg. The content of oxygen in air is 20.9%. Mount McKinley is the highest mountain peak in North America, with a summit elevation of 6,194 m above sea level and an atmospheric pressure of about 600 mm Hg. What is the best estimate for the partial pressure of oxygen on the summit? a. 760 mmHg b. 159 mmHg c. 600 mmHg d. 126 mmHg e. 20.9% f. 15.5% 3. Respiration relies on the diffusion of gases as across respiratory surfaces such as lung or gill epithelia. The Fick equation estimates the diffusion of gases across the respiration surfaces. How do the following parameters of the Fick equation affect gas diffusion rates across respiratory surfaces? a. Increased distance between capillaries and medium i. Increase ii. Decrease iii. No effect b. Increased gas concentration gradient i. Increase

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ii. Decrease iii. No effect c. Decreased total area of the diffusion interface i. Increase ii.
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