(5.1) Heart Beat & Cardiac Output: The Cardiovascular System Quiz
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Questions and Answers

What is the main function of autorythmic cells in the heart?

  • Regulate blood pressure
  • Act as pacemaker (correct)
  • Produce red blood cells
  • Conduct oxygen to the heart muscle

    • During depolarization in action potential generation, what ions flow into the cell?

  • Fe2+
  • Na+ (& Ca2+) (correct)
  • Cl-
  • K+ (& Mg2+)

    • What is the main phase of action potential in contractile cells responsible for triggering muscle contraction?

  • Repolarization
  • Depolarization (correct)
  • Plateau
  • Refractory period

    • What is the purpose of the refractory period in the cardiac cycle?

    <p>Preventing immediate recontraction</p> Signup and view all the answers

    Which term describes a common observation in an Electrocardiogram (ECG) as 'RS' waves during QRS?

    <p>Normal sinus rhythm</p> Signup and view all the answers

    What is the cardiac cycle defined as?

    <p>The time taken for a single heartbeat cycle</p> Signup and view all the answers

    What is the term used to describe the volume of blood pumped by the heart in one minute?

    <p>Cardiac Output</p> Signup and view all the answers

    Which hormone is responsible for increasing heart rate and contractility?

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

    What is the term for the amount of blood ejected by the heart in one contraction?

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

    Which of the following factors directly affects Stroke Volume?

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

    What component of the nervous system is responsible for decreasing heart rate?

    <p>Parasympathetic nervous system</p> Signup and view all the answers

    Which ion plays a crucial role in enhancing contractility in cardiac muscle?

    <p>Calcium (Ca2+)</p> Signup and view all the answers

    What is the purpose of coronary circulation?

    <p>To supply blood to the myocardium of the heart</p> Signup and view all the answers

    What is the function of autorhythmic cells in the heart?

    <p>Produce action potentials that trigger heart contractions</p> Signup and view all the answers

    Which circulation involves blood flow between the heart and lungs?

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

    What is a key feature of cardiac muscle cells?

    <p>Possessing gap junctions for electrical coupling</p> Signup and view all the answers

    Which part of the heart starts coronary circulation?

    <p>Ascending aorta</p> Signup and view all the answers

    What is the primary function of systemic circulation?

    <p>Distributing oxygenated blood to the body systems</p> Signup and view all the answers

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