22. In the cardiac cycle, the occurrence of the diastole is most likely indicated at which of the following labeled sites on the ECG or phonocardiogram shown? A) OB) A B Electrocardiogram Phonocardiogram C) D) E)
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- 64 In the cardiac cycle, the occurrence of S, is most likely indicated at which of the following labeled points on the ECG or phonocardiogram? O) A B) A C B Electrocardiogram Phonocardiogram C) D) E)Select the TRUE statement/s: During the isovolumetric contraction phase in the cardiac cycle, OA) the SL valves are open O B) the intraventricular pressure is increasing O C) the intraventricular volume does not change OD) Both A and C OE) Both B and C1. In a healthy heart, which of the following statements is TRUE?A) Depolarization of the interventricular septum occurs from right to left.B)The right ventricle depolarizes before the left ventricle.C) The wave of depolarization passes more quickly through the AV node than the Purkinje fibers.D) The QRS complex is predominantly upright in Leads I and II. E) The mean electrical axis is generally between +100 and +150 degrees. 2. Which of the following is most likely to be present on the resting EKG recording of a patient with AV node damage?A) An R-R interval of 0.52 seconds at rest.B) A P-R interval of 0.28 seconds at rest.C)An inverted T waveD) Normal sinus rhythm
- 10. An EKG with a higher QRS complex than normal... A)None of these are true B)Must mean that the end diastolic volume is higher C)Must mean that the ventricular contraction is stronger than normal D)Must mean that the person is exercising and innervating more cardiomyocytes E)Must mean that atrial repolarization is smaller than usual so we see more ventricular repolarization16. A 62-year-old man comes to the emergency department because of chest pain. Cardiac catheterization shows blockage of the circumflex branch of the left coronary artery. The occlusion of this vessel most likely damaged which of the following areas of the heart? A) Anterior wall of left ventricle B) Inferior wall of left ventricle C) Interventricular septum D) Lateral wall of left ventricle E) Right ventricleIf an individual has a heart rate of 80 bpm; end diastolic volume of 140 ml and end systolic volume of 100 ml; calculate the cardiac output: OA) 8,000 ml B) 1,200 ml O. C) 3,200 ml OD) 4,000 ml O E) 6,000 ml
- In a healthy heart, which of the following statements is TRUE?A) Depolarization of the interventricular septum occurs from right to left.B)The right ventricle depolarizes before the left ventricle.C) The wave of depolarization passes more quickly through the AV node than the Purkinje fibers.D) The QRS complex is predominantly upright in Leads I and II. E) The mean electrical axis is generally between +100 and +150 degrees.7. The P-Wave in the electrocardiogram... A)Gives information about the oxygenation content of the blood B)Happens when the semilunar valves are closed C)Can give information about how much blood is pumped out D)Represents atrial contraction E)Two of these options are correct70 Which of the following phases of the ventricular action potential most closely coincides with the T wave of the ECG? OA) OB) A B с O C) D E D) E)
- Figure shows the conduction system of the heart that transmit the electrical impulses for the coordination of cardiac cycle. a) Referring to the Figure , which part of the heart's electrical conduction is known as the “pacemaker” of the heart? b)Explain how D controls atria and ventricles which causes ventricular systole.23 The aortic valve opens at which of the following lettered points on the ventricular volume curve? ÇD O A) O B) 130- A q 50 C) B D) Time E E) Ø G OF) G)117. A 45-year-old man with severe tricuspid valve prolapse undergoes a valve replacement operation. As the surgeon places sutures to secure the new valve in place, which following parts of the conduction system of the heart is most likely to sustain damage? OA) Atrioventricular bundle O B) Internodal fibers O C) Limbus fossa ovalis OD) Moderator band O E) Sinoatrial node
