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Res 140 ex 1

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Which of the following does NOT increase the affinity of Hb for oxygen?   show
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What is the affect of an elevated intracellular 2,3-DPG concentration?   show
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Which of the following would you expect to find with “oxygen debt”?   show
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show B) The bases receive about 20 times more blood flow than the apexes.  
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show D) Rate of pulmonary blood flow  
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A 70-kg male patient has a VCO2 of 200 ml/min and a VA of 9 L/min. From this information, what can you infer?   show
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show A) A level of 60 mm Hg marks the beginning of the steep part of O2Hb dissociation curve.  
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The highest PCO2 levels are found in what location?   show
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At body temperature, how much oxygen will physically dissolve in plasma at a PO2 of 40 mm Hg?   show
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show C) Oxygenation  
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show A) Decreased affinity of Hb for oxygen.  
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show D) I, II, and III I. Blood exiting the pulmonary capillary will have a PO2 = 40 and a PCO2 = 46. II. The area represents an alveolar shunt. III. The V/Q is 0.  
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Which of the following conditions must exist for gas to move between the alveolus and pulmonary capillary?   show
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show B) 75 mm Hg  
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show A) 5 ml/dl  
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show D) Haldane effect  
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As the amount of oxygen that dissolves in the plasma increases, what is it directly proportional to?   show
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show B) PO2 = 100 mm Hg; PCO2 = 40 mm Hg; PN2 = 573 mm Hg; PH2O = 47 mm Hg  
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show A) I, II, and III I. Alveolar epithelial membrane II. Capillary endothelial membrane III. Interstitial space IV. Transbronchial radial tethering mechanisms  
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In a person breathing room air (and with all else being normal), if the alveolar PCO2 rises from 40 to 70 mm Hg, what would you expect?   show
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show A) PO2 = 40 mm Hg; PCO2 = 46 mm Hg  
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In which of the following conditions will erythrocyte concentration of 2,3-DPG be decreased?   show
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show A) Decrease in the CaO2 - CvO2  
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show C) II and III II. Formation of methemoglobin (metHb). III. Inability of metHb to bind with oxygen.  
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show B) True  
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show C) Hb  
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show A) I and II I. The affinity of Hb for oxygen decreases. II. The Hb saturation for a given PO2 falls.  
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Which of the following are potential causes of hypoxia?   show
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When a Hb molecule accumulates excessive amounts of HCO3-, it is expelled from the cell in exchange for Cl-. What is this called?   show
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show C) 75%  
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In which of the following forms is carbon dioxide transported by the blood?   show
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Under normal physiologic circumstances, how many milliliters of oxygen are capable of combining with 1 g of Hb?   show
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show B) 4.0 L/min  
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show B) Gaseous diffusion  
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show D) The V/Q is lower than the average.  
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Which of the following equations best describes oxygen delivery to the tissues?   show
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show B) Dysoxia  
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show B) I and II I. The affinity of Hb for oxygen decreases. II. The Hb saturation for a given PO2 falls.  
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What role does the Bohr effect play in oxygen transport?   show
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What is the most common cause of hypoxemia?   show
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show D) 200 or greater  
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Under what conditions will the alveolar PACO2 rise above normal?   show
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The lowest PO2 would normally be found in what location?   show
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Given the following blood parameters, compute the total oxygen content (dissolved + HbO2) of the blood in ml/dl: Hb = 16; PO2 = 625 Hg; SO2 = 100%.   show
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show C) It delivers more oxygen to tissues at low PaO2 than normal Hb.  
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Which of the following gases would diffuse fastest across the alveolar-capillary membrane?   show
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show B) 0.25 second  
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show C) Most blood flows through the bases of the lung.  
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show B) 110 to 120 mm Hg  
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show B) 17.7 ml/dl  
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