Cardiac Conduction System Overview
34 Questions
1 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

Where is the heart located in the body?

  • Above the kidneys
  • In the abdominal cavity
  • Behind the liver
  • Between the lungs in the mediastinum (correct)

    • What separates the heart from other structures?

  • Myocardium
  • Endocardium
  • Pericardium (correct)
  • Epicardium

    • How many chambers does a typical heart have?

  • 6 chambers
  • 4 chambers (correct)
  • 3 chambers
  • 5 chambers

    • Which part of the heart pumps blood out to the body or lungs?

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

    What is the role of auricles in the heart?

    <p>Pump blood into the atria</p> Signup and view all the answers

    Which layer of the heart is the most superficial?

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

    What is the role of Ca++ channels at 0mV in the heart?

    <p>Closing to prevent premature contractions</p> Signup and view all the answers

    Which part of the heart has the slow Ca++ channels that allow for the plateau phase?

    <p>Purkinje fibers</p> Signup and view all the answers

    If not for endocrine control, how many times per minute would the AV node fire?

    <p>40 - 60</p> Signup and view all the answers

    What is the purpose of electrodes placed on the body in relation to the heart's electrical signals?

    <p>To record electrical signals of the heart</p> Signup and view all the answers

    What is the abbreviation commonly used for Electrocardiogram?

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

    What is the main purpose of AEDs in relation to cardiac issues?

    <p>To correct fibrillations</p> Signup and view all the answers

    Which phase of the cardiac cycle involves pumping blood into circulation?

    <p>Ventricular systole</p> Signup and view all the answers

    What happens during atrial systole in the cardiac cycle?

    <p>Atria contract to push blood into the ventricles</p> Signup and view all the answers

    What is the role of myoglobin in cardiac muscle metabolism?

    <p>Storing oxygen in muscle cells</p> Signup and view all the answers

    What represents the amount of blood left in the ventricles after stroke volume is pushed out?

    <p>End systolic volume (ESV)</p> Signup and view all the answers

    What characterizes the phase of ventricular diastole in the cardiac cycle?

    <p>Relaxation with semilunar valves open and atrioventricular valves closed</p> Signup and view all the answers

    What is the function of the endothelium in the heart?

    <p>Releases strong vasoconstrictors</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 (AV) node in the heart?

    <p>Forces the atrioventricular septum to contract</p> Signup and view all the answers

    How does the sinoatrial (SA) node contribute to cardiac function?

    <p>Inferior portion of right atrium known as the pacemaker</p> Signup and view all the answers

    What is the role of desmosomes in cardiac muscle cells?

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

    Why do valve disorders primarily occur in the heart?

    <p>Due to inflammation</p> Signup and view all the answers

    Which type of cell initiates and propagates the action potential through the heart?

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

    During which phase do cardiac contractile cells plateau before repolarizing?

    <p>+30mV Na+ channels close</p> Signup and view all the answers

    Which heart sound is associated with the closing of atrioventricular valves?

    <p>S1</p> Signup and view all the answers

    What does S2 represent in terms of heart sounds?

    <p>Opening of semilunar valves</p> Signup and view all the answers

    What term is used when both S3 and S4 heart sounds are present?

    <p>S7</p> Signup and view all the answers

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

    <p>CO = HR * SV</p> Signup and view all the answers

    What is the normal range for Cardiac Output (CO) in a healthy individual?

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

    What percentage of blood pumped represents the Ejection Fraction?

    <p>$50 - 70$%</p> Signup and view all the answers

    What is the target heart rate range used to maintain a high Cardiac Output during exercise?

    <p>$120 - 150$ bpm</p> Signup and view all the answers

    Where does the nervous control of Heart Rate originate from?

    <p>Medulla oblongata</p> Signup and view all the answers

    Which hormone is released by sympathetic stimulation and shortens the repolarization period?

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

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser