Heart physiology and ECG UPDATED.

Heart physiology and ECG UPDATEDThe AV valves close in response to the -ANSWER contraction of the ventricles and the resulting rise in ventricular pressure action potentials received directly from ... stimulate the papillary muscles to contract, allowing for the proper ... of the AV valves -ANSWER purkinje fibers, closing mitral valve prolapse severe enough to cause regurgitation may directly cause ... pressure in the ... atrium -ANSWER increased, left the semilunar valves remain open throughout the ... phase of the cardiac cycle -ANSWER late ventricular systole the atria remain in diastole throughout both the ... phases of the cardiac cycle -ANSWER ventricular systole and ventricular diastole positive inotropes allow the heart to pump ... blood with fewer heart beats. they do this by ... the end-systolic volume (ESV) -ANSWER more, decreasing an individual with high blood pressure (hypertension) is expected to benefit from the administration of ... inotropic drugs that ... the hearts workload -ANSWER negative, decrease the expected effect of the drug Digoxin is to ... ventricular contraction and ... stroke volume -ANSWER strengthen, increase a first degree block is caused by -ANSWER delay of the action potential between the SA and AV nodes the rate of ventricular conduction is best determined by the ... on an ECG -ANSWER number of QRS complexes present within a specific unit of time an ECG tracing from someone with a third-degree AV block is best described as tracing with a -ANSWER 2:1 ratio of P waves to QRS complexes a recording of electrical changes occurring in the myocardium during a cardiac cycle -ANSWER electrocardiogram the P wave corresponds to the depolarization of the muscle fibers of the ... -ANSWER atria .