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.
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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.
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- 1. 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 rhythmWhich of the following statements concerning the heart is TRUE? A) The SA node is located in the interventricular septum B) The bundle of His is located in the interventricular septum C) The Purkinje fibers stimulate the ventricles in a superior to inferior direction D) Both A & C E) All of the aboveThe ST segment in the EKG is typically quiet and on the isoelectric line (like the T-P segment). What is happening during the ST segment in the EKG such that we see no waves? a) There is no electrical activity happening in the ventricles between the S and T waves b) The heart is relaxed and filling with blood c) The ST segment is representative of the plateau of the many ventricular action potentials happening at that point d) There is no longer Na+ influx during the ST segment so no waves are visible e) The ST segment is during ventricular repolarization and repolarization is not seen on the EKG
- Which of the following statements about the heart is TRUE? A) The sinoatrial node generates the fastest action potentials in the heart B) The parasympathetic branch of the nervous system decreases heart rate C) The sinoatrial node passes the action potentials to the AV node D) Both B & C E) All of the aboveSelect the correct statement regarding the AV node B) it produces the P wave on the EKG C) it is also known as the heart's pacemaker D)it contains autorhythmic cellsSelect 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 C
- Which of the following statements concerning the heart is TRUE? A) The SA Node is the pacemaker because it repolarizes faster than the other auto-rhythmic portions of the heart B ) Insufficient blood flow to the heart is called ischemia C) In 3rd degree heart block, the auto-rhythmic portions of the ventricles set the rate of ventricular contractions, while the SA node sets the rate for atrial contractions D) Both B & C E) All of the aboveA 55-year-old man has been diagnosed with Stokes-Adams syndrome. Two minutes after the syndrome starts to cause active blockade of the cardiac impulse, which of the following is the pacemaker of the heart? A) Sinus node B) A-V node C) Purkinje fibers D) Cardiac septum E) Left atriumFigure 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.
- 16. 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 ventricleFollowing the initation of the electrical impulse in the heart, it is distributed by a) Endocardium b) Purkinjie fibers c) Bundle of His d) EpicardiumWhich heart activity correlated with the hi-lighted portion of the EKG in this image? A)ventricle depolarization B) repolarization C) right heart depolarization D) atrial depolarization