Duration of Contraction in Cardiac Muscle
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Questions and Answers

What is the main factor determining the duration of contraction in cardiac muscle?

  • Heart rate
  • Conduction velocity
  • Strength of contraction
  • Duration of the action potential (correct)

    • Where is the sinus node located?

  • In the right atrium (correct)
  • Near the tricuspid valve
  • In the left ventricle
  • Near the pulmonary artery

    • What is the function of the A-V bundle in the heart's conduction system?

  • Generating action potentials
  • Regulating heart rate
  • Controlling blood flow
  • Conducting the action potential from atria to ventricles (correct)

    • How long does it take for the cardiac impulse to pass from the atria into the ventricles?

    <p>Less than 0.1 second</p> Signup and view all the answers

    What initiates each cardiac cycle?

    <p>Spontaneous generation of an action potential in the sinus node</p> Signup and view all the answers

    What is the significance of the plateau phase in cardiac muscle contraction?

    <p>Determining duration of contraction</p> Signup and view all the answers

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