EVALUATED PBSE EXAM QUESTIONS AND ANSWERS

EVALUATED PBSE EXAM QUESTIONS AND ANSWERS The right coronary artery is said to be dominant when... - CORRECT ANSWER -it gives rise to the posterior descending artery The primary structural units of proteins are - CORRECT ANSWER -L-amino acids which clotting factor is activated by contact with foreign surfaces, roughened vascular walls, and platelet aggregates? - CORRECT ANSWER -XII (Hageman) The effect of plasmin is to - CORRECT ANSWER -limit clotting by splitting of fibrin the normal arterio-venous oxygen difference is approximately - CORRECT ANSWER -5 volumes percent a characteristic of the oxygen dissociation curve for fetal hemoglobin is that - CORRECT ANSWER -it shifts to the left of the maternal curve at a given PO2, increasing the PCO2 results in - CORRECT ANSWER -less oxygen bound to hemoglobin a sample of blood cooled from 37 C will undergo which of the following changes - CORRECT ANSWER - CO2 becomes more soluble and paCO2 decreases If the diffusion coefficient for oxygen is 1, the diffusion coefficient for carbon dioxide is: - CORRECT ANSWER -20.3 in 85-95% of patients, the circumflex artery supplies the - CORRECT ANSWER -lateral aspect of the left ventricle the obtuse marginal artery is a branch of the - CORRECT ANSWER -circumflex artery diagonal coronary arteries supply the - CORRECT ANSWER -anterior wall of the LV which arterial wall layer is composed of lamellae of smooth muscle and elastic tissue - CORRECT ANSWER -tunica media a characteristic of leukocytes is that they are - CORRECT ANSWER -larger than platelets the main function of an enzyme is to - CORRECT ANSWER -increase the rate of a biochemical reaction the classical pathway of complement activation is initiated by - CORRECT ANSWER -antibody-antigen reactions which of the following is not a normal route for blood return to the interior of the heart - CORRECT ANSWER -bronchial veins the effect of a calcium blocking drug is - CORRECT ANSWER -a marked decrease in trans membrane calcium current the most significant side effect of verapamil is - CORRECT ANSWER -severe A-V block persantine interferes with the function of - CORRECT ANSWER -platelets the cardiovascular effects of amrinone include - CORRECT ANSWER -decreased pulmonary artery pressure Cephalosporins have little antimicrobial activity against - CORRECT ANSWER -pseudomonas aeruginosa which of the following anesthetic agents has the shortest duration of action - CORRECT ANSWER - sufentanyl which of the following does not occur with morphine sulfate - CORRECT ANSWER -increased peripheral vascular resistance which of the following drugs increases the tolerance of the brain to global ischemia when administered prior to an ischemic episode - CORRECT ANSWER -pentothal digitalis preparations are most commonly used to - CORRECT ANSWER -a) increase myocardial contractility and control atrial arrhythmias the most common site of traumatic aortic disruption due to deceleration injury is - CORRECT ANSWER - between the left subclavian artery and the ligamentum arteriosum obstruction of blood flow through the mitral valve would most likely be caused by a - CORRECT ANSWER -left atrial myxoma atrial myxomas are primarily located - CORRECT ANSWER -intraseptal reduced coronary blood flow can result in - CORRECT ANSWER -an elevation of creatinine phosphokinase (CPK-MB)