Electrocardiogram (ECG) Basics
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Questions and Answers

What is the main function of the SA node in the heart?

  • To slow down heart rate
  • To excite itself and generate electrical impulses (correct)
  • To regulate blood pressure
  • To conduct electrical signals from atria to ventricles

    • Which ion plays a crucial role in maintaining the resting potential of -70mV in heart muscle cells?

  • Chloride (Cl-)
  • Potassium (K+) (correct)
  • Sodium (Na+)
  • Calcium (Ca2+)

    • Why is a refractory period necessary for the heart muscle?

  • To prevent electrical conduction between atria and ventricles
  • To allow relaxation and filling of the heart chambers (correct)
  • To maintain a steady heart rate
  • To speed up contractions

    • What is the function of the Bundle of His in the heart's conduction system?

    <p>To provide an electrical connection between atria and ventricles</p> Signup and view all the answers

    In which phase of the action potential does repolarization occur?

    <p>Repolarization</p> Signup and view all the answers

    What is the role of Na+/K+ pump in maintaining the resting potential of heart muscle cells?

    <p>It maintains ion concentrations inside and outside the cell</p> Signup and view all the answers

    How does an ECG detect electrical activity in the heart?

    <p>By detecting electrical fields of muscle fibers</p> Signup and view all the answers

    Which statement accurately describes Purkinje fibers' role in heart conduction?

    <p>They conduct action potentials from the apex of the heart upwards</p> Signup and view all the answers

    What abnormality is associated with a vector pointing away from an area with myocardial infarction on an ECG?

    <p>Thickened left ventricular wall</p> Signup and view all the answers

    What effect does hyperpolarization have on heart muscle cells?

    <p>It maintains the resting potential after repolarization</p> Signup and view all the answers

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