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
  • Blood carries oxygen and nutrients
  • Blood vessels hold and transport blood
  • Heart pumps blood through the vessels
• What is meant by a double circulatory system?

  It has two distinct loops for blood flow
• What happens to deoxygenated blood in the circulatory system?

  It goes to the lungs to gain oxygen
• What is the path of oxygenated blood in the circulatory system?

  It flows to the body and returns deoxygenated
• 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 first step in the blood flow through the heart?

  Blood flows into the heart via vena cava
• What happens to blood in the pulmonary vein?

  It is oxygenated from the lungs
• What occurs when the atria contract?

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

  They contract and push blood out
• 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 does the term artery refer to?

  A vessel carrying blood away from the heart
• What does the term vein refer to?

  A vessel carrying blood to the heart
• Why can arteries carry deoxygenated blood?

  Because they transport blood away from the heart
• Why can veins carry oxygenated blood?

  Because they transport blood to the heart
• What supplies the heart with oxygenated blood?

  Coronary arteries
• What is the function of coronary arteries?

  • Supply oxygenated blood to the heart
  • Branch off from the aorta
  • Encircle the heart muscle tissue
• What is the total number of times the heart beats in a day?

  Over 100,000 times
• What happens to the heart's rhythm if pacemaker cells fail?

  It may require an artificial pacemaker
• What is the significance of the heart's muscular walls?

  They enable strong contractions to pump blood
• How does the heart's structure relate to its function?

  Chambers and valves ensure efficient blood flow
• What is the function of the aorta?

  To feed the rest of the body
• What is the role of the pulmonary artery?

  To carry deoxygenated blood to the lungs
• What is the role of the pulmonary vein?

  To carry oxygenated blood from the lungs
• What happens to blood after it gives up oxygen to tissues?

  It becomes deoxygenated and returns to the heart