The Heart
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Questions and Answers

Which chamber of the heart receives poorly oxygenated (venous) blood from the body?

  • Right atrium (correct)
  • Left ventricle
  • Left atrium
  • Right ventricle
  • Which chamber of the heart receives well-oxygenated (arterial) blood from the lungs?

  • Left atrium (correct)
  • Right atrium
  • Left ventricle
  • Right ventricle
  • Which chamber of the heart pumps blood into the aorta for distribution to the body?

  • Right atrium
  • Left ventricle (correct)
  • Left atrium
  • Right ventricle
  • Which event marks the beginning of diastole?

    <p>Closure of aortic and pulmonary valves</p> Signup and view all the answers

    What causes the first heart sound (lub) heard with a stethoscope?

    <p>Closure of atrioventricular valves</p> Signup and view all the answers

    What causes the second heart sound (dub) heard with a stethoscope?

    <p>Closure of aortic and pulmonary valves</p> Signup and view all the answers

    What event marks the end of diastole?

    <p>Ventricular shortening and emptying</p> Signup and view all the answers

    Which layer of the heart wall is composed of cardiac muscle?

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

    What is the outermost layer of the heart wall called?

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

    Which layer of the heart wall lines the internal surface of the heart and its valves?

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

    Which structure of the heart prevents the orifices of the valves from being overly distended?

    <p>Fibrous skeleton</p> Signup and view all the answers

    What is the function of the fibrous skeleton of the heart?

    <p>Prevents valve distension</p> Signup and view all the answers

    Which part of the heart provides attachment for the leaflets and cusps of the valves?

    <p>Fibrous skeleton</p> Signup and view all the answers

    What shape does the heart appear to be from an anterior or posterior view?

    <p>Tipped-over pyramid</p> Signup and view all the answers

    What is the function of the fibrous skeleton in terms of electrical conduction in the heart?

    <p>Forms an electrical insulator</p> Signup and view all the answers

    Which part of the heart is formed mainly by the left atrium?

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

    Where is the apex of the heart located in adults?

    <p>Posterior to the left 5th intercostal space</p> Signup and view all the answers

    Which surface of the heart is formed mainly by the left ventricle and partly by the right ventricle?

    <p>Diaphragmatic (inferior) surface</p> Signup and view all the answers

    Which part of the heart remains motionless throughout the cardiac cycle?

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

    Which part of the heart receives the pulmonary veins?

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

    Which border of the heart is formed by the right atrium and extends between the superior vena cava and the inferior vena cava?

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

    What structure emerges from the superior border of the heart?

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

    What is the arterial continuation of the right ventricle and divides into right and left pulmonary arteries?

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

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