CCI practice exam already graded A+

CCI practice exam already graded A+ The second heart sound is caused by closure of what two valves? Aortic and pulmonic What phase of the cardiac cycle immediately follows closure of the semilunar valves and precedes the opening of the AV valves? Isometric relaxation What percentage of ventricular filling normally results from atrial contraction? 15-20% Peripheral venous pressure is the same as what pressure? Right atrial Which hemodynamic measurement most directly reflects left ventricular afterload? Mean BP In a normal patient with a fixed cardiac output the mean arterial blood pressure is determined cheifly by? Afterload The rate induced regulation of the force of contraction, sometimes called the staircase, treppe, or bowdich effect is? Rapid HR increases the force of contraction Which class of vessels has the capacity to store the largest volume of blood? Systemic veins Closure of the semilunar heart valves is associated with a hemodynamic what? Diacrotic notch Central venous pressure is the same as what other pressure? Right atrial The amount of blood pumped from each ventricle during a single systole is the? Stroke volume The naturally occurring neurotransmitter liberated at the parasympathetic nerve junction is? Acetylcholine What is the primary effect of vagal nerve stimulation on the heart? Decreases automaticity Baro-Receptors in the aortic arch are termed? Stretch receptors Mild depression in ventilation results in? Positive chronotropism What is the baseline trasmembrane voltage inside the resting cardiac muscle cell? -90 MV Which portion of the EKG represents the time when both atria depolarize? P wave What is the velocity of electrical conduction through the AV node? 0.02-0.1 M/sec What is the hearts normal conduction sequence to the HIS bundle? SA node, RA artrial muscle, LA muscle, AV node