Heart Regulation: Chronotropic Factors of the Autonomic Nervous System
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Questions and Answers

What is the normal pace of the heart in beats per minute?

  • 60 to 70
  • 80 to 90
  • 90 to 100
  • 70 to 80 (correct)

    • What is the term for the braking provided by the parasympathetic nervous system?

  • Vagal tone (correct)
  • Sympathetic stimulation
  • Cardiac accelerator
  • Baroreceptor response

    • What is the term for an abnormal heart rhythm?

  • Arrhythmia (correct)
  • Heart block
  • Ectopic focus
  • Nodal rhythm

    • What is the primary function of the cardiac accelerator center in the autonomic nervous system?

    <p>To stimulate the SA and AV nodes to speed up the heart rate (B)</p> Signup and view all the answers

    What is the wave that represents ventricular repolarization in an electrocardiogram?

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

    What type of receptors are located in the aorta and carotid arteries and alert the cardiac centers to changes in blood pressure?

    <p>Baroreceptors (D)</p> Signup and view all the answers

    What is the term for a focus other than the SA node that sets the heart's pace?

    <p>Ectopic focus (C)</p> Signup and view all the answers

    What is the sound produced by the closing of the semilunar valves during ventricular systole?

    <p>Dupp (D)</p> Signup and view all the answers

    What is the effect of potassium ions on the heart rate?

    <p>Negative chronotropic effect (B)</p> Signup and view all the answers

    What is the function of the parasympathetic neurons of the vagus nerve in regulating the heart rate?

    <p>To maintain the vagal tone at 70-80 beats/min (A)</p> Signup and view all the answers

    Which of the following has a positive chronotropic effect on the heart rate?

    <p>Epinephrine (B)</p> Signup and view all the answers

    What is the role of proprioceptors in regulating the heart rate?

    <p>To alert the cardiac centers to changes in the body's activity level (D)</p> Signup and view all the answers

    What is the primary factor that determines the cardiac output?

    <p>Stroke volume (A)</p> Signup and view all the answers

    What is responsible for increasing the heart rate during the 'fight or flight' response?

    <p>Cardiac accelerator (B)</p> Signup and view all the answers

    Which of the following receptors provides information to the cardiac regulator centers regarding blood pressure?

    <p>Baroreceptors (B)</p> Signup and view all the answers

    What is the term for the difference between the maximum cardiac output and the resting cardiac output?

    <p>Cardiac reserve (D)</p> Signup and view all the answers

    What is the name of the law that describes the relationship between preload and stroke volume?

    <p>Frank-Starling law (A)</p> Signup and view all the answers

    What is the normal range of heart rate in beats per minute?

    <p>64-80 bpm (B)</p> Signup and view all the answers

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