BMS 300 Exam 4 corrections (Verified)

Ouabain is a plant toxin that blocks the Na/K ATPase. You would expect to find labeled ouabain in the: a. apical membranes of the epithelial cells of the descending limb of the loop of the nephron b. in the apical membranes of the epithelial cells of the proximal convoluted tubule c. in the basilar membranes of the epithelial cells in the thick segment of the ascending limb d. in the basilar membranes of the epithelial cells of the distal convoluted tubule e. c and d are correct correct answers e. c and d are correct In the capillaries of the brain, carbonic anhydrase in erythrocytes predominately generates: a. CO2 from HCO3- and H+ b. HCO3- and H+ from CO2 and H2O c. Oxyhemoglobin d. O2 from CO2 e. a and b are correct correct answers b. HCO3- and H+ from CO2 and H2O The driving force that moves water from the luminal to the basolateral side of epithelial cells in the proximal convoluted tubule results from: a. a lower water concentration on the basolateral side of the epithelial cells b. the effects of Na/K ATPase pumps moving Na+ from the epithelial cell cytoplasm into the extracellular space on the basolateral side of the cell c. the effects of Na driven cotransporters allowing Na+ to leave the epithelial cells d. all of the above are correct e. only a and b are correct correct answers e. only a and b are correct Disaccharidases convert disaccharides to hexose sugars. These enzymes are examples of: a. brush border enzymes b. enzymes released from acinar cells c. enzymes secreted as inactive precursors enzymes d. enzymes that enter the duodenum from the pancreas e. all except a are correct correct answers a. brush border enzymes Type II pneumocytes release amphipathic molecules that are composed mostly of phosphatidycholine to: a. increase lung compliance b. decrease lung compliance c. decrease lung elastic recoil d. increase lung elastic recoil e. a and c are correct correct answers e. a and c are correct