MCQ Structures of the Conducting System PDF

# Structures of the Conducting System ## Multiple Choice Questions 1. Which of the following are Structures of the Conducting System? a) Sinoatrial (SA) node b) Atrioventricular (AV) node c) His bundle d) all of the above 2. Which of the following are Structures of the Conducting...

# Structures of the Conducting System ## Multiple Choice Questions 1. Which of the following are Structures of the Conducting System? a) Sinoatrial (SA) node b) Atrioventricular (AV) node c) His bundle d) all of the above 2. Which of the following are Structures of the Conducting System? a) Bundle branches b) Purkinje fibers c) both a and b d) none of the above 3. Where is the Sinoatrial (SA) node located? a) In the posterior wall of the right atrium b) In the left ventricle c) In the right ventricle d) In the septum 4. What does the SA node contain? a) Coronary artery cells b) Pacemaker cells c) Muscle cells d) Nerve cells 5. How many action potentials per minute does the SA node generate? a) 50-70 b) 80-100 c) 120-140 d) 160-180 6. Which of the following is the location of the Atrioventricular (AV) Node? a) In floor of right atrium b) Purkinje Fibers c) His bundle d) all of the above 7. What is the primary function of the AV node? a) To generate action potentials b) To delay the impulse c) To conduct the impulse to the Purkinje fibers d) All of the above 8. What is the action potential rate generated by the AV node? a) 10-20 per minute b) 20-30 per minute c) 40-60 per minute d) 60-80 per minute 9. What is the period of ventricular contraction during the cardiac cycle? a) Systole b) Diastole c) Isovolumetric Ventricular Contraction d) Ventricular Ejection 10. Which phase of the cardiac cycle is responsible for the ventricles filling with blood? a) Systole b) Diastole c) Isovolumetric Ventricular Contraction d) Ventricular Ejection 11. Which phase of the cardiac cycle is the response period of ventricular relaxation? a) Systole b) Diastole c) Isovolumetric Ventricular Contraction d) Ventricular Ejection 12. Which of the following is the response to Late diastole? a) On heart sound its S1 b) On heart sound its S2 c) On heart sound its S3 d) On heart sound its S4 13. Which of the following is Isovolumetric Ventricular Contraction? a) Its S1 on heart sound b) Its S2 on heart sound c) Its S3 on heart sound d) Its S4 on heart sound 14. Which of the following factors increase the preload? a) Hypervolemia b) Regurgitation of cardiac valves c) Heart failure (HF) d) all of the above 15. Which of the following factors increase afterload? a) Hypertension b) Vasoconstriction c) both a and b d) none of the above 16. Which of the following is normally more than Ejection fraction (EF)? a) 55% b) 66% c) 77% d) 88%