1) Carbon dioxide is transported in the blood in the form of:- a) physically dissolved b) as bicarbonate c) bound to plasma proteins d) bound to hemoglobin 2) the following is/are incorrect statement about alveoli a) Alveolar Type Ⅱ cells secrete pulmonary surfactant b) The structure of alveoli provides low surface area for gas exchange c) Alveoli are very thin and are surrounded by the network of capillaries so that air and blood are separated by the very thin barrier d) Alveoli are the site of gas exchange in the lungs 3) The factor that will reduce the amount of exygen transfer across the repiratory membrane include: a) A higher partial pressure of exygen in the atmosphere b) An abnormally high partial pressure of carbon dioxide in atmosphere c) A reduced partial pressure of carbon dioxide in the atmosphere d) A low pulmonary capillary,partial pressure of oxygen 4) Carbonic anhydrase a) prevent increase in blood PH b) catalyzesthe formation of carbonic acid from carbon dioxide and water c) is found in the red blood cells d) indirectly involved in chloride shift 5) The amount of oxygen unloaded from hemoglobin at the tissue level increases when a) the concentration of DPG in the red cells decreases b) the concentration of DPG in the red blood cells increases c) partial pressure of CO2 in the tissue increases d) the acidity of the tissue is in increases

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