Cardiac Muscle Physiology Quiz
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Cardiac Muscle Physiology Quiz

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Questions and Answers

What are the 2 audible sounds of a healthy heart?

  • S3 and S4
  • S1 and S3
  • S1 and S2 (correct)
  • S2 and S4

    • What is the cause of heart murmurs?

  • Excessive blood pressure
  • Turbulent blood flow (correct)
  • Blockage in coronary arteries
  • Weak cardiac muscles

    • What is the formula for calculating Cardiac Output (CO)?

  • CO = HR * SV (correct)
  • CO = SV / HR
  • CO = SV - HR
  • CO = HR + SV

    • What is the normal range of Cardiac Output (CO) in liters per minute?

    <p>4 - 8 L/min</p> Signup and view all the answers

    What does Ejection Fraction represent?

    <p>The percentage of blood pumped in one heartbeat</p> Signup and view all the answers

    What happens to Stroke Volume (SV) during intense exercise?

    <p>Decreases as HR increases</p> Signup and view all the answers

    What is the main function of the atria in the heart?

    <p>Collect blood and push it into the lower chambers</p> Signup and view all the answers

    Which chamber of the heart connects to the pulmonary trunk?

    <p>Right ventricle</p> Signup and view all the answers

    What distinguishes the pulmonary artery from other arteries?

    <p>It is the only artery to carry deoxygenated blood</p> Signup and view all the answers

    Which layer of the heart produces lubricating fluid in the pericardial cavity?

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

    What is located at the base of the heart?

    <p>Superior vena cava</p> Signup and view all the answers

    What is the main function of ventricles in the heart?

    <p>Pump blood out to the body or lungs</p> Signup and view all the answers

    What would happen if Ca++ channels did not close at 0mV?

    <p>Premature contractions would occur</p> Signup and view all the answers

    Which component of the heart's electrical system has the highest natural firing rate?

    <p>SA node</p> Signup and view all the answers

    What is the main role of Ca++ binding to troponin in muscle contraction?

    <p>Allow myosin and actin cross-bridge formation</p> Signup and view all the answers

    If the atrioventricular bundle fires 35 times per minute, what is the heart rate?

    <p>55 BPM</p> Signup and view all the answers

    What is the purpose of recording electrical signals of the heart with electrodes for an ECG?

    <p>To detect abnormal heart rhythms</p> Signup and view all the answers

    Which part of the heart's electrical system is responsible for depolarizing the ventricles?

    <p>QRS complex</p> Signup and view all the answers

    What is the main function of an artificial pacemaker in relation to the heart?

    <p>Delivering electrical impulses for effective heart contractions</p> Signup and view all the answers

    During which phase of the cardiac cycle does blood flow from the atria into the ventricles?

    <p>Atrial diastole</p> Signup and view all the answers

    What is the main purpose of an automated external defibrillator (AED) in cardiac emergencies?

    <p>Correcting fibrillations</p> Signup and view all the answers

    Which term refers to the amount of blood pushed out by the ventricles during each heartbeat?

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

    What is the condition characterized by an interruption in the normal conduction pathway of the heart?

    <p>Heart block</p> Signup and view all the answers

    Which layer of the heart lines the chambers filled with blood and covers the heart valves?

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

    Which structure divides the heart into chambers and is a physical extension of the myocardium?

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

    What is the main function of the atrioventricular valves in the heart?

    <p>Separate atria from ventricles</p> Signup and view all the answers

    Which chamber of the heart receives deoxygenated blood from systemic circulation?

    <p>Right atrium</p> Signup and view all the answers

    Which valve in the heart separates the ventricles from blood vessels?

    <p>Pulmonary valve</p> Signup and view all the answers

    What is the function of the coronary circulation in the heart?

    <p>Provide nutrients and oxygen to the myocardium</p> Signup and view all the answers

    Which component of cardiac muscle cells initiates and propagates the action potential through the heart?

    <p>Autorhythmic cells</p> Signup and view all the answers

    What is the main function of gap junctions in cardiac muscle cells?

    <p>Facilitate the spread of ions between cells</p> Signup and view all the answers

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