Cardiac Muscle Contraction and Electrical Conduction Quiz
33 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

What is the role of the atria in the heart?

  • Push blood into the ventricles (correct)
  • Collect deoxygenated blood and pump it out to the body or lungs
  • Collect oxygenated blood and pump it out to the body or lungs
  • Produce lubricating fluid for the pericardial cavity

    • Which chamber of the heart is responsible for pumping blood out to the body or lungs?

  • Left atrium
  • Right ventricle
  • Left ventricle (correct)
  • Right atrium

    • What separates the two layers of the serous pericardium in the heart?

  • Myocardium
  • Pericardial cavity (correct)
  • Lubricating fluid
  • Fat-filled grooves

    • Which structure of the heart produces fluid that lubricates the pericardial cavity?

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

    In which circuit does the right ventricle of the heart connect to the pulmonary trunk?

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

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

    <p>Contain muscle cells, nerve fibers, and blood vessels</p> Signup and view all the answers

    What happens at 0mV during repolarization of the heart?

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

    What role do Ca++ ions play in the process of muscle contraction?

    <p>Ca++ binds to troponin to enable myosin and actin cross-bridge formation</p> Signup and view all the answers

    Which component of the heart's conduction system has the fastest intrinsic firing rate?

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

    What is the purpose of placing electrodes on the body in an ECG?

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

    In an ECG, what does a longer QT interval indicate?

    <p>Increased risk of arrhythmias</p> Signup and view all the answers

    What is the main purpose of AED's?

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

    During which phase of the cardiac cycle does systole occur?

    <p>During ventricular systole</p> Signup and view all the answers

    What is the function of myoglobin in heart cells?

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

    What happens during the T wave in the heart's electrical activity?

    <p>Repolarization of the ventricles</p> Signup and view all the answers

    What occurs during atrial systole in the cardiac cycle?

    <p>Atrial contraction following depolarization</p> Signup and view all the answers

    What is the significance of end systolic volume (ESV) in the cardiac cycle?

    <p>Amount of blood left in ventricles after stroke volume is pushed out</p> Signup and view all the answers

    Which heart sound is produced by the closing of the atrioventricular valves?

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

    What does S2 correspond to in the heart cycle?

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

    What is the normal range for cardiac output in liters per minute?

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

    Which factor contributes to an increase in cardiac output?

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

    What is the formula to calculate cardiac output?

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

    What is the ejection fraction formula in terms of end-diastolic volume (EDV) and end-systolic volume (ESV)?

    <p>$EF = SV / EDV$</p> Signup and view all the answers

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

    <p>Release vasoconstrictor hormones</p> Signup and view all the answers

    What is the purpose of the fossa ovalis in the heart?

    <p>Was an opening while a fetus</p> Signup and view all the answers

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

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

    What is the function of the moderator band in the heart?

    <p>Help in cardiac conduction</p> Signup and view all the answers

    Which valve in the heart has no muscular attachments but makes an audible sound as it closes?

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

    What is the main role of coronary veins in the heart?

    <p>Bring deoxygenated blood back to the right atrium</p> Signup and view all the answers

    What is the function of desmosomes in cardiac muscle cells?

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

    Which structure in the heart serves as the pacemaker and sets the normal cardiac rhythm?

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

    What is responsible for creating spontaneous depolarization in cardiac conductive cells?

    <p>$\text{Na}^+$ channels open</p> Signup and view all the answers

    Which characteristic is unique to cardiac contractile cells during repolarization?

    <p>They plateau before repolarizing</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser