An arrhythmia originating in an escape pacemaker in the AV junction with a rate of 40 to 60 beats per minute is called a(n): LO A. Agonal ythm OB. Junctional bradycardia O C. Junctional escape rhythm OD. Complete AV block
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- Blood flow through capillaries in the walls of the left ventricle is ______. A unnecessary because the myocardiocytes in the wall of the left ventricle get plenty of O2 from the blood they pump B greatest during diastole; these capillaries are squeezed shut during systole when the surrounding muscle cells contract C greatest during systole; blood stops following through capillaries during diastole because the heart is relaxed5. This is not and will not be gradedLong term effect of a large A-V fistula will be a. decreased blood flowb. increased TPRc. high output failured. high hemoglobin levele. low cardiac output
- During which phase of cardiac cycle is pressure in the aorta the highest? a. atrial systoleb. isovolumetric ventricular contractionc. atrial diastoled. ventricular systolee. isovolumetric relaxationPR interval in ECG represents mainly which of the following a. atrial depolarizationb. ventricular depolarizationc. septal depolarizationd. AV nodal delaye. atrial repolarizationAt what point is the pressure in the ventricles increasing most rapidly? A when both sets of valves are closed at the beginning of ventricular systole B midway through ventricular systole C during atrial systole when the volume of the ventricles is reaching its peak D just after the dicrotic notch E immediately before the ventricles relax
- Repolarization of the ventricles typically _______. A begins at the end of the T-wave and continues through the next P wave B occurs throughout the duration of the S-T segment of the electrocardiogram C begins at the top center of the ventricles like depolarization D begins at the apex of the ventricles and occurs in the opposite direction as depolarization.If the sinoatrial node stopped generating action potentials the heart would _____. A stop beating because the sinoatrial node is the heart's pacemaker B beat with a slower frequency due to the spontaneous depolarization of the AV node C go into fibrillation immediately because the heart cells would no longer function in a coordinated rhythm D continue to beat normally because the sympathetic neurons going to the cardiomyocytes would initiate the depolarizationDuring the TP interval of the ECG/cardiac cycle which of the following is true 1. atrioventricular valves are open 2. atrioventricular valves are closed 3. semilunar valves are open 4. semilunar valves are closed Group of answer choices (A) 1 and 3 (B) 1 and 4 (C) 2 and 3 (D) 2 and 4