Anatomy: Veins Characteristics and Blood Distribution
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Questions and Answers

What initiates the S1 sound in the heart?

  • Closure of AV valves (correct)
  • Opening of semilunar valves
  • Blood flow from ventricles to atria
  • Increase in ventricular pressure

    • What characterizes isovolumetric contraction in the heart?

  • AV valves open
  • Volume remains constant in ventricles (correct)
  • Pressure drop in ventricles
  • Semilunar valves open

    • At what pressure do the semilunar valves open in the left ventricle?

  • 100-110 mmHg
  • 15-20 mmHg
  • 40-50 mmHg
  • 80-90 mmHg (correct)

    • What is the name for the volume of blood ejected from the ventricle in one heart beat?

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

    What event leads to the 'S2 dub' sound in the heart?

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

    During which phase of the cardiac cycle does atrial depolarization begin?

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

    What occurs during ventricular diastole?

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

    Where is the end diastolic volume typically found?

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

    What initiates ventricular repolarization during a cardiac cycle?

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

    Where are the semilunar valves located in the heart?

    <p>At the entrance to the aorta and pulmonary artery</p> Signup and view all the answers

    What is the primary function of the atrioventricular (AV) valves in the heart?

    <p>Prevent blood from flowing back into the atria when ventricles contract</p> Signup and view all the answers

    What initiates the opening and closing of heart valves during the cardiac cycle?

    <p>Changes in blood pressure inside the heart chambers</p> Signup and view all the answers

    Why do semilunar valves close when ventricles relax?

    <p>To prevent blood from flowing back into the ventricles</p> Signup and view all the answers

    What happens if the AV valves become incompetent in a healthy heart?

    <p>Blood will flow back into the atria when ventricles contract</p> Signup and view all the answers

    What causes the AV valve to slam shut into the atria during the shutting process?

    <p>Pressure in the ventricle greater than pressure in the atria</p> Signup and view all the answers

    Where does blood flow after leaving the right ventricle through the pulmonary valve?

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

    What triggers the opening of the semilunar valves in the heart?

    <p>Pressure in the aorta is higher than pressure in the ventricles</p> Signup and view all the answers

    What purpose do the valves in the heart serve?

    <p>Ensure one-way blood flow</p> Signup and view all the answers

    What is the location of the atrioventricular sulcus in the heart?

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

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