L18 Heart Rate Regulation
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Questions and Answers

Which part of the nervous system is primarily responsible for regulating heart rate under resting conditions?

  • Posterior hypothalamus
  • Cerebral cortex
  • Respiratory center
  • Vagal tone (correct)

    • Which of the following reflexes is responsible for the increase in heart rate due to increased venous return?

  • Carotid sinus syndrome
  • Bainbridge reflex (correct)
  • McDowal's reflex
  • Marey's Law

    • According to Marey's Law, what is the relationship between heart rate and arterial blood pressure?

  • Heart rate is exponentially related to arterial blood pressure
  • Heart rate is independent of arterial blood pressure
  • Heart rate is directly proportional to arterial blood pressure
  • Heart rate is inversely proportional to arterial blood pressure (correct)

    • Which of the following is the correct pathway for the Bainbridge reflex?

    <p>Increased venous return → increased right atrial pressure → stimulation of atrial stretch receptors → increased cardiac filling → increased heart rate</p> Signup and view all the answers

    Which part of the hypothalamus is responsible for stimulating the Cardiac Acceleratory Center (CAC) and increasing heart rate?

    <p>Posterior hypothalamus</p> Signup and view all the answers

    What is the effect of deep inspiration on heart rate according to the text?

    <p>Deep inspiration increases heart rate</p> Signup and view all the answers

    What is the mechanism by which stimulation of the carotid sinus baroreceptors can lead to bradycardia?

    <p>Stimulation of the Cardiac Inhibitory Center (CIC)</p> Signup and view all the answers

    Which of the following is a direct mechanism by which the respiratory center can influence heart rate?

    <p>Respiratory sinus arrhythmia</p> Signup and view all the answers

    What is the effect of sympathetic stimulation on the heart?

    <p>Increases the heart rate</p> Signup and view all the answers

    Which of the following statements about heart rate is true?

    <p>The average heart rate for adults is around 70 beats per minute</p> Signup and view all the answers

    Which factor does NOT contribute to physiological variations in heart rate?

    <p>Body mass index (BMI)</p> Signup and view all the answers

    Which of the following statements about the regulation of heart rate is true?

    <p>The parasympathetic nervous system decreases the SA nodal discharge and heart rate</p> Signup and view all the answers

    Which of the following heart rates would be considered bradycardia?

    <p>50 beats per minute</p> Signup and view all the answers

    What is the typical heart rate for an infant?

    <p>Around 120 beats per minute</p> Signup and view all the answers

    Which of the following factors contributes to a lower heart rate in athletes?

    <p>Their heart is stronger and more efficient</p> Signup and view all the answers

    What is the primary mechanism by which the autonomic nervous system regulates heart rate?

    <p>By controlling the SA nodal discharge</p> Signup and view all the answers

    What is the effect of voluntary contraction of skeletal muscles on heart rate?

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

    Which of the following accurately describes the effect of hypoxia (low oxygen) on heart rate?

    <p>Mild to moderate hypoxia causes tachycardia, while severe hypoxia causes bradycardia</p> Signup and view all the answers

    Which hormone is associated with an increase in heart rate?

    <p>All of the above</p> Signup and view all the answers

    What is the effect of applying pressure on the eyeball (oculo-cardiac reflex) on heart rate?

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

    How does moderate hypercapnia (increased carbon dioxide) affect heart rate?

    <p>Causes tachycardia</p> Signup and view all the answers

    Which of the following substances causes bradycardia (decreased heart rate)?

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

    What is the approximate increase in heart rate for every 1°C rise in body temperature?

    <p>10-13 beats per minute</p> Signup and view all the answers

    Which of the following is NOT a factor that regulates heart rate?

    <p>Dietary habits</p> Signup and view all the answers

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