Resp Prob

# Resp Prob - and carbon dioxide(PCO 2 are 160 and 0.2 mm...

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Respiration Air pressure is created by the weight of the gases surrounding the earth in a layer that is a couple of hundred miles thick. The weight of a column of air 1 inch x 1 inch x 200 miles high is 14.7 lbs. per square inch at sea level. The pressure of this weight of gases is called atomospheric pressure. At sea level, the atmospheric pressure will support a column of mercury 760 mm high. Since air contains a mixture of different gases, the full measurement of 760 mm Hg is the total pressure of the mixture of air. Of these various gases, each contributes only part of the column’s weight and therefore only part of the pressure exerted by the column. Oxygen occupies approximately 21% by volume and exerts a pressure of 0.21 x 760mm, or 160 mm Hg. Nitrogen occupies approximately 78% and exerts a pressure of 0.78 x 760, or 593 mm Hg. Carbon dioxide at only 0.03% of the air by volume exerts 0.0003 x 760, or 0.2 mm. Consequently the partial pressures of oxygen (PO 2
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Unformatted text preview: ) and carbon dioxide (PCO 2 ) are 160 and 0.2 mm respectively. Look at fig A and note the effect of altitude on air pressure. Figure B illustrates gas exchange in the lungs and tissues at sea level. You can see how altitude would impact the ability to move O 2 from the alveolus of the lung into the capillary. So let’s pretend. ... You are flying over Due West at 35,000 ft. when suddenly, your window bursts open causing sudden decompression of the cabin of your plane. Of course, you bail out and parachute to safety, happily landing in the open area of the quad. a. Using the figures below and working alone, calculate how great of a problem you will have getting sufficient oxygen at 35,000 ft when decompression occurs. Compare breathing ability at this altitude with breathing at sea level. Show your work and explain thoroughly. b. How great of a problem is there for gas exchange at 12,000 ft as you descend in your parachute? (calculate, show your work and explain)...
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## This note was uploaded on 04/08/2008 for the course BG 111 taught by Professor Edwards during the Spring '08 term at Erskine.

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