The Heart

• What is the role of the circulatory system?

  To transport oxygen and nutrients
• What are the three main components of the circulatory system?

  Blood, blood vessels, and heart
• What does blood carry in the circulatory system?

  Oxygen and nutrients
• How does the heart function in the circulatory system?

  It pumps blood to keep it moving
• What is the structure of the circulatory system?

  • Composed of blood, blood vessels, and heart
  • Functions as a double circulatory system
  • Contains two distinct loops
• What happens to deoxygenated blood in the circulatory system?

  It travels from the heart to the lungs
• What occurs to oxygenated blood in the circulatory system?

  It is delivered to the body's tissues
• How many chambers does the heart have?

  Four chambers
• What are the top chambers of the heart called?

  Atria
• What are the bottom chambers of the heart called?

  Ventricles
• What is the function of valves in the heart?

  To prevent blood from flowing backwards
• What is the path of blood flow through the heart?

  From vena cava and pulmonary vein to atria
• What happens when the atria contract?

  They push blood into the ventricles
• What do the ventricles do after the atria contract?

  They push blood out into arteries
• How often does the heart cycle repeat?

  About 70 times a minute
• What is the role of pacemaker cells in the heart?

  They produce electrical impulses for contraction
• What is an artificial pacemaker?

  A device that regulates heart contractions
• What is the definition of an artery?

  A vessel carrying blood away from the heart
• What is the definition of a vein?

  A vessel carrying blood to the heart
• Why can the pulmonary artery be considered an artery?

  It carries deoxygenated blood away from the heart
• Why can the pulmonary vein be considered a vein?

  It carries oxygenated blood to the heart
• What are coronary arteries responsible for?

  Supplying oxygenated blood to the heart
• What are the key components of the heart's structure?

  • Four chambers: atria and ventricles
  • Thick muscular walls
  • Valves to prevent backflow
  • Coronary arteries for oxygen supply
• What is the total number of times the heart beats in a day?

  Over 100,000 times
• What is the significance of the heart's muscular walls?

  They enable effective blood pumping
• How does the structure of the heart support its function?

  Chambers and valves ensure unidirectional blood flow
• What is the purpose of the electrical impulses produced by pacemaker cells?

  To trigger heart muscle contractions
• How do the atria and ventricles work together during the heart cycle?

  Atria contract, then ventricles contract
• What is the function of the vena cava?

  To bring deoxygenated blood to the heart
• What is the function of the pulmonary vein?

  To bring oxygenated blood to the heart