Cardiac Conduction System and Phases Quiz
43 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which of the following is the primary mechanism by which the sympathetic nervous system increases heart rate?

  • Decreasing parasympathetic stimulation
  • Increasing afterload
  • Increasing stroke volume
  • Increasing cAMP in pacemaker cells (correct)

    • During exercise, which of the following is the easiest way to increase cardiac output?

  • Increasing stroke volume (correct)
  • Increasing heart rate
  • Increasing afterload
  • Increasing preload

    • Which of the following is true about the changes in cardiovascular function during exercise?

  • Systole increases while diastole stays the same (correct)
  • Systole and diastole both increase
  • Systole increases while diastole decreases
  • Systole decreases while diastole increases

    • What is the primary effect of gravity on blood flow when going from sitting to standing?

    <p>Decreased venous return and cardiac stroke volume</p> Signup and view all the answers

    Which of the following organs or tissues has decreased cardiac output during exercise?

    <p>Skin, kidneys, and abdominal organs</p> Signup and view all the answers

    How does exercise training affect resting heart rate and stroke volume?

    <p>Resting heart rate decreases and stroke volume increases</p> Signup and view all the answers

    What is the effect of the parasympathetic nervous system on heart rate?

    <p>Decreases the rate of SA node depolarization, decreasing heart rate</p> Signup and view all the answers

    What is the primary effect of increased preload on stroke volume?

    <p>Increases stroke volume</p> Signup and view all the answers

    Which of the following is a characteristic of right-sided heart failure?

    <p>Blood backs up into the body, causing pitting edema and ascites</p> Signup and view all the answers

    What is the primary effect of increased afterload on stroke volume?

    <p>Decreases stroke volume</p> Signup and view all the answers

    What is the primary effect of decreased contractility on ejection fraction?

    <p>Decreases ejection fraction</p> Signup and view all the answers

    What is the primary effect of increased heart rate on cardiac output?

    <p>Increases cardiac output</p> Signup and view all the answers

    Which of the following statements about preload is true?

    <p>Preload is the volume of blood in the ventricle prior to contraction.</p> Signup and view all the answers

    What is the primary factor that determines afterload?

    <p>Total peripheral resistance</p> Signup and view all the answers

    If stroke volume increases, what happens to cardiac output?

    <p>Cardiac output increases</p> Signup and view all the answers

    What is the relationship between preload and stroke volume?

    <p>As preload increases, stroke volume increases up to a certain point.</p> Signup and view all the answers

    What is the normal ejection fraction for a healthy heart?

    <p>60%</p> Signup and view all the answers

    Which of the following factors directly affects cardiac output?

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

    If end systolic volume (ESV) decreases, what happens to stroke volume?

    <p>Stroke volume increases</p> Signup and view all the answers

    Which of the following factors increases venous return (preload)?

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

    What is the relationship between contractility and end systolic volume (ESV)?

    <p>Increased contractility leads to decreased ESV.</p> Signup and view all the answers

    If the ejection fraction remains constant at 60% during exercise, what happens to end diastolic volume (EDV)?

    <p>EDV increases</p> Signup and view all the answers

    What is the primary effect of gravity on blood flow when transitioning from sitting to standing?

    <p>Decreased venous return</p> Signup and view all the answers

    How does exercise influence stroke volume?

    <p>Increases end-diastolic volume</p> Signup and view all the answers

    Which factor plays a crucial role in regulating stroke volume during exercise?

    <p>Increased contractility</p> Signup and view all the answers

    What is the primary effect of the parasympathetic nervous system on heart rate?

    <p>Decreases heart rate by releasing Ach onto pacemaker cells</p> Signup and view all the answers

    How does sympathetic stimulation affect cardiac output during exercise?

    <p>Increases cardiac output through enhanced contractility</p> Signup and view all the answers

    Which statement best describes the impact of increased afterload on stroke volume?

    <p>Decreases stroke volume by lowering contractility</p> Signup and view all the answers

    What is the primary effect of going from a sitting to a standing position on blood flow to the brain?

    <p>Decreased blood flow to the brain</p> Signup and view all the answers

    How does exercise training affect resting heart rate and stroke volume?

    <p>Resting heart rate decreases and stroke volume increases</p> Signup and view all the answers

    During exercise, which of the following is the easiest way to increase cardiac output?

    <p>Increasing stroke volume</p> Signup and view all the answers

    What is the primary effect of the parasympathetic nervous system on heart rate?

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

    Which of the following organs or tissues experiences decreased cardiac output during exercise?

    <p>Skin, kidneys, abdominal organs</p> Signup and view all the answers

    What is the primary effect of going from a sitting to a standing position on blood flow?

    <p>It decreases venous return and preload</p> Signup and view all the answers

    During aerobic exercise, what is the primary mechanism for increasing cardiac output?

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

    What is the primary effect of the parasympathetic nervous system on the cardiovascular system?

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

    Which of the following factors primarily determines afterload on the heart?

    <p>Total peripheral resistance</p> Signup and view all the answers

    What is the primary effect of the Frank-Starling mechanism on stroke volume?

    <p>It increases stroke volume as preload (end-diastolic volume) increases</p> Signup and view all the answers

    During aerobic exercise, what is the primary effect on stroke volume?

    <p>Stroke volume increases</p> Signup and view all the answers

    What is the primary mechanism by which the sympathetic nervous system increases heart rate during exercise?

    <p>Increasing the firing rate of the sinoatrial (SA) node</p> Signup and view all the answers

    What is the primary function of the respiratory pump in relation to cardiovascular function?

    <p>It increases venous return during inhalation</p> Signup and view all the answers

    What is the primary effect of the skeletal muscle pump on cardiovascular function during exercise?

    <p>It increases venous return and preload</p> Signup and view all the answers

    What is the normal range for ejection fraction in a healthy heart?

    <p>60-70%</p> Signup and view all the answers

    More Like This

    SA Node Modulation Quiz
    6 questions

    SA Node Modulation Quiz

    CourteousTopaz avatar
    CourteousTopaz
    Cardiac Muscle Physiology Overview
    37 questions

    Cardiac Muscle Physiology Overview

    ModernComposite avatar
    ModernComposite
    Cardiovascular System II
    44 questions

    Cardiovascular System II

    AppreciableDouglasFir avatar
    AppreciableDouglasFir
    Cardiac Conduction System
    5 questions

    Cardiac Conduction System

    CompliantJasper4970 avatar
    CompliantJasper4970
    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser