Reviewed Pbse Questions And Answers

REVIEWED PBSE QUESTIONS AND ANSWERS A normal arterio-venous oxygen difference is approximately what? a. 7mmHg b. 40mmHg c. 5 volumes percent d. 14 volumes percent - CORRECT ANSWER -5 volumes percent The effect of plasmin is to? a. limit clotting by splitting fibrin b. initiate the intrinsic pathway c. cleave thrombin d. activate the extrinsic pathway - CORRECT ANSWER -limit clotting by splitting fibrin Which clotting factor is activated by contact with foreign surfaces, roughened vascular walls, and platelet aggregation? a. V b. XII c. VIII d. X - CORRECT ANSWER -Factor XII (Factor XII is often called Hageman factor) The primary structural unit of proteins are? a. pyruvic acid b. conjugated fatty acids c. L-amino acids d. ribonucleic acids - CORRECT ANSWER -L-amino acids The main function of an enzyme is to do what? a. increases the rate of a biochemical reaction b. initiates a biochemical reaction c. acts as a substrate for a biochemical reaction d. alters the equilibrium of a biochemical reaction - CORRECT ANSWER -increase the rate of a biochemical reaction In 55% of patients, which coronary artery gives rise to blood supply for the SA node? a. right b. circumflex c. posterior descending d. obtuse marginal - CORRECT ANSWER -right Diagonal coronary arteries supply the : a. anterior wall of LV