Physiology: Action Potential and ECG Tracing
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Questions and Answers

What is the period during which an action potential cannot be initiated?

  • Ventricular repolarization
  • Relative refractory period
  • Atrial depolarization
  • Absolute refractory period (correct)

    • What is the normal sequence of events on an ECG tracing?

  • QRS complex, P wave, T wave
  • P wave, QRS complex, T wave (correct)
  • T wave, QRS complex, P wave
  • P wave, T wave, QRS complex

    • What is the intrinsic rate of the Sinoatrial node?

  • 60-100 bpm (correct)
  • 20-40 bpm
  • 100-120 bpm
  • 40-60 bpm

    • Which wave on the ECG tracing represents ventricular repolarization?

    <p>T wave</p> Signup and view all the answers

    During which phase of the cardiac action potential does the rapid depolarization occur?

    <p>Phase 0 - P wave</p> Signup and view all the answers

    What is the term for the return of an abnormal heartbeat to a normal rhythm?

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

    What is the function of the Bundle of His?

    <p>To transmit cardiac action potentials from the AV node to the Purkinje fibers</p> Signup and view all the answers

    What is the period during which an action potential can be initiated with a larger than normal stimulus?

    <p>Relative refractory period</p> Signup and view all the answers

    What is the term for the process by which the blood stops bleeding after an injury?

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

    What is the role of the Atrioventricular node in the cardiac conduction system?

    <p>To pause the electrical impulse to allow action potential to spread across atria for coordinated contraction</p> Signup and view all the answers

    During which phase of the cardiac action potential does the increase in Ca++ occur?

    <p>Phase 2 - ST segment</p> Signup and view all the answers

    What is the intrinsic rate of the Purkinje fibers?

    <p>20-40 bpm</p> Signup and view all the answers

    What is the role of von Willebrand factor in platelet plug formation?

    <p>Binding platelet receptors to the vessel wall</p> Signup and view all the answers

    What is the purpose of the intrinsic pathway in blood coagulation?

    <p>To initiate clotting in the circulation</p> Signup and view all the answers

    What is the role of ADP and TXA2 in platelet plug formation?

    <p>Attracting additional platelets to the site of injury</p> Signup and view all the answers

    What is the purpose of the prothrombin time (PT) test?

    <p>To measure the time it takes for blood to clot via the extrinsic pathway</p> Signup and view all the answers

    What occurs during clot retraction?

    <p>The edges of the injury are pulled together with actin and myosin</p> Signup and view all the answers

    What is the result of clot retraction?

    <p>The squeezing of plasma out of the clot</p> Signup and view all the answers

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