The Cardiovascular System: The Heart - Chapter 19.1 Quiz
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Questions and Answers

What is the unique feature of the pulmonary artery in terms of the blood it carries?

  • It carries blood directly to the left ventricle
  • It carries deoxygenated blood (correct)
  • It carries oxygenated blood
  • It carries both oxygenated and deoxygenated blood
  • Which layer of the heart produces lubricating fluid?

  • Epicardium (correct)
  • Endocardium
  • Myocardium
  • Parietal layer of serous pericardium
  • Where is the base of the heart located in relation to the apex?

  • Inferior and lateral
  • Superior and medial (correct)
  • Superior and lateral
  • Inferior and medial
  • What is the function of the ventricles in the heart?

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

    What is located within the sulci of the heart?

    <p>Fat-filled grooves that contain coronary blood vessels</p> Signup and view all the answers

    How many auricles are present in a typical heart and what is their function?

    <p>Two; Hold blood and empty into atria</p> Signup and view all the answers

    What happens at 0mV in the heart cells based on the provided information?

    <p>Ca++ channels close and K+ channels open</p> Signup and view all the answers

    Which component of the heart's electrical activity is responsible for depolarization of the ventricles?

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

    What is the role of troponin in the heart muscle contraction process?

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

    Which of the following components is responsible for repolarization in the heart's electrical activity?

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

    If the SA node fires at a rate of 90 times per minute, what would be the expected rate of firing of the atrioventricular bundle based on the information provided?

    <p>30 - 40 times per minute</p> Signup and view all the answers

    What is the function of an artificial pacemaker in managing heart conditions?

    <p>Delivers electrical impulses to ensure effective heart contractions</p> Signup and view all the answers

    Which heart chamber has a small contractile phase and contains pectinate muscles?

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

    What makes an audible sound as they close according to the text?

    <p>Semilunar valves</p> Signup and view all the answers

    What is the function of desmosomes in cardiac muscle cells?

    <p>Stop the cells from ripping apart</p> Signup and view all the answers

    What initiates and propagates the action potential through the heart?

    <p>Myocardial conducting cells</p> Signup and view all the answers

    Where is the Sinoatrial (SA) node located?

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

    In cardiac conductive cells, which channels allow a slow influx of Na+ to create spontaneous depolarization?

    <p>Ca++ channels</p> Signup and view all the answers

    What is the total time from initial impulse to ventricle depolarization approximately according to the text?

    <p>~225 ms</p> Signup and view all the answers

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