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Quiz: Introduction to the Cardiovascular System

  1. The cardiovascular system begins to develop and reaches a functional state after the development of other major organ systems.
  2. The function of the heart is vital because, to survive, the tissues need a continuous supply of oxygen and nutrients and metabolic waste products have to be removed from them.
  3. The normal adult heart pumps about 5 liters of blood every hour throughout life.
  4. The outer layer of the heart wall is the myocardium, the middle layer is the epicardium, and the inner layer is the endocardium.
  5. When the ventricles contract, atrioventricular valves close to prevent blood from flowing back into the atria. When the ventricles relax, semilunar valves close to prevent blood from flowing back into the ventricles.
  6. Because the sinoatrial node establishes the basic rhythm of the heartbeat, it is called the pacemaker of the heart.
  7. Based on their structure and function, blood vessels are classified as the pulmonary vessels, the systemic vessels, arteries, capillaries, or veins.
  8. Capillaries form the connection between the vessels that carry blood away from the heart and the vessels that return blood to the heart.
  9. As the total cross-sectional area of the vessels increases, the velocity of flow also increases.
  10. The pump for the pulmonary circuit, which circulates blood through the lungs, is the left ventricle.