22) Which of the following represents the accurate sequence of the spread of cardiac excitation? (2 pts) a) Right atrium β right ventricle β left atrium β left ventricle b) Right ventricle β left atrium β left ventricle β right atrium c) SA node β AV node β bundle of His β Purkinje fibers d) SA node β bundle of His β AV node β Purkinje fibers 23) During the P-Q interval, which of the following mechanical events is/are occurring? Choose ALL that apply. (2.5 points) a) Atria contract. b) AV valves close creating the S1 heart sound. c) Blood volume in the ventricles increases. d) Pressure in the atria increases. e) Ventricles depolarize. 24) Match the ECG components to the appropriate description. (4 points) Matching options: β’ P wave β’ PQ interval β’ QRS complex β’ ST segment β’ T wave β’ TP interval a) Which ECG component corresponds to atrial depolarization? b) Which ECG component corresponds to ventricular depolarization? c) Which ECG component represents the time from the beginning of atrial excitation to the beginning of ventricular excitation? d) Which ECG component represents the time when the contractile muscle fibers of the ventricles are completely depolarized? e) What ECG wave comes immediately before ventricular systole? f) If heart rate increased, which ECG component would change the most? g) Which ECG wave comes immediately before atrial contraction? h) Which ECG wave comes immediately before ventricular relaxation?
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6. In a normal electrocardiogram, the 7. In the cardiac cycle, 8. Blood does not enter or leave the ventricles during the period called 9. Blood does not enter or leave the ventricles during the period called 10. Stimulation of the heart via the sympathetic nerves would
1. Which of these statements is true? A. The left coronary artery is a branch of the left pulmonary vein. B. The coronary sinus returns blood to the left atrium. C. The coronary arteries arise from the pulmonary trunk. D. The great cardiac vein collects blood from the anterior surface of the heart. E. The pulmonary arteries carry blood to the left atrium. 2. These vessels transport blood to the right and left lungs. A. aorta B. right atrium C. pulmonary trunk D. pulmonary arteries E. pulmonary veins 3. The cardiac electrical impulse normally begins spontaneously in the SA node because A. of the superior location of the SA node in the right atrium. B. the SA node is the only area of the heart capable of spontaneous depolarization. C. of the rich sympathetic innervation of the SA node. D. this area depolarizes more rapidly than any other portion of the conduction system. E. of action potentials from the cardioregulatory center. 4. The action potentials are slowed at the AV node to allow the A. ventricles to repolarize. B. ventricles to completely empty of blood. C. pacemaker to reset for the next beat. D. atria to complete their contraction. E. atria to begin their contraction. 5. Which of the following areas of the conduction system would produce spontaneous act most frequently if the SA node were not functioning? A. AV bundle B. Purkinje fibers C. AV node D. bundle branch E. the pacemaker.
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