the heart

• What is the main function of the circulatory system?

  Transport food and oxygen to cells
• What role does the heart play in the circulatory system?

  It pumps blood around the body
• What are the main components of the circulatory system?

  Heart, blood vessels, and blood
• How many circuits are in the human circulatory system?

  Two circuits joined together
• What does the right ventricle do in the circulatory system?

  Pumps deoxygenated blood to the lungs
• What happens to blood after it takes in oxygen in the lungs?

  It returns to the heart
• What does the left ventricle do in the circulatory system?

  Pumps oxygenated blood to the body
• How many chambers does the heart have?

  Four chambers
• What are the names of the heart's chambers?

  Right atrium, right ventricle, left atrium, left ventricle
• What are the main blood vessels associated with the heart?

  Vena cava, pulmonary artery, aorta, pulmonary vein
• What is the function of the heart valves?

  Prevent blood from flowing backwards
• Why do coronary arteries matter?

  They supply oxygenated blood to the heart
• What happens if coronary arteries become blocked?

  Heart can become starved of oxygen
• What is the role of the heart's pacemaker?

  Controls the natural resting heart rate
• Where is the pacemaker located in the heart?

  In the right atrium wall
• What does the pacemaker produce to control heart rate?

  A small electric impulse
• What happens when the pacemaker sends an impulse?

  Surrounding muscle cells contract
• What is the process of blood flow through the heart?

  1. Blood enters the atria from the vena cava and pulmonary vein.
  2. Atria contract, pushing blood into the ventricles.
  3. Ventricles contract, forcing blood into the pulmonary artery and aorta.
  4. Blood flows to organs through arteries and returns through veins.
  5. Atria fill again, and the cycle repeats.
• What are the differences between the right and left ventricles in the heart?

  • Right ventricle pumps deoxygenated blood to lungs.
  • Left ventricle pumps oxygenated blood to the body.
• What are the key components of the human heart's structure?

  • Four chambers: right atrium, right ventricle, left atrium, left ventricle
  • Main blood vessels: vena cava, pulmonary artery, aorta, pulmonary vein
  • Valves to ensure correct blood flow direction
• What is the significance of the heart's pacemaker?

  • Controls resting heart rate
  • Generates electric impulses for muscle contraction
• What happens during a heart attack related to coronary arteries?

  • Blockage of coronary arteries
  • Heart becomes starved of oxygen
  • Can lead to heart failure