Left Atrium and Ventricle
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Left Atrium and Ventricle

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Questions and Answers

Which part of the heart forms the superior part of the left border of the heart and overlaps the root of the pulmonary trunk?

  • The right atrium
  • The right auricle
  • The left atrium
  • The left auricle (correct)

    • Which veins enter the smooth-walled left atrium?

  • Superior and inferior vena cava
  • Pulmonary trunk and aorta
  • Right and left pulmonary veins (correct)
  • Right and left coronary veins

    • What does the semilunar depression in the interatrial septum indicate?

  • The right atrium
  • The floor of the oval fossa (correct)
  • The valve of the oval fossa
  • The left atrium

    • What forms most of the base of the heart?

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

    Which chamber of the heart contains an interatrial septum that slopes posteriorly and to the right?

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

    Where does the left atrium discharge the oxygenated blood it receives from the pulmonary veins?

    <p>Into the left ventricle</p> Signup and view all the answers

    Which part of the left atrium contains pectinate muscles?

    <p>The smaller muscular auricle</p> Signup and view all the answers

    How does the wall thickness of the left atrium compare to that of the right atrium?

    <p>The left atrium has a slightly thicker wall than the right atrium.</p> Signup and view all the answers

    Through which orifice does the left atrium discharge its blood into the left ventricle?

    <p>Left AV orifice</p> Signup and view all the answers

    Which ventricle performs more work due to the higher arterial pressure in the systemic circulation?

    <p>Left ventricle</p> Signup and view all the answers

    What is the thickness ratio between the walls of the left ventricle and the right ventricle?

    <p>2:1</p> Signup and view all the answers

    What covers the walls of the left ventricle?

    <p>Trabeculae carnae</p> Signup and view all the answers

    Which ventricle has a conical cavity that is longer?

    <p>Left ventricle</p> Signup and view all the answers

    Which chamber has larger anterior and posterior papillary muscles?

    <p>Left ventricle</p> Signup and view all the answers

    What is the name of the smooth-walled, non-muscular outflow part of the left ventricle?

    <p>Aortic vestibule</p> Signup and view all the answers

    What valve guards the left atrioventricular orifice?

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

    Where is the aortic orifice located in the left ventricle?

    <p>Posterior part</p> Signup and view all the answers

    What structure attaches the cusps of the aortic valve to the fibrous ring surrounding the aortic orifice?

    <p>Chordae tendineae</p> Signup and view all the answers

    Which valve is located posterior to the sternum at the level of the 4th costal cartilage?

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

    What is the function of the tendinous cords in the mitral valve?

    <p>To prevent the cusps from being forced into the left atrium</p> Signup and view all the answers

    What is the significance of the reversal of flow around the anterior cusp of the mitral valve?

    <p>It causes a change in direction of the bloodstream</p> Signup and view all the answers

    Where is the semilunar aortic valve located?

    <p>Posterior to the left side of the sternum at the level of the 3rd intercostal space</p> Signup and view all the answers

    What supports the mitral valve and allows it to resist the pressure developed during contractions of the left ventricle?

    <p>Papillary muscles</p> Signup and view all the answers

    Which of the following statements about pectinate muscles is true?

    <p>They help the right atrium dilate without much wall stress.</p> Signup and view all the answers

    What is the function of pectinate muscles in the right atrium?

    <p>Increase the surface area of the atrial chamber</p> Signup and view all the answers

    Which chamber of the heart has less developed pectinate muscles?

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

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