Circulatory system-the heart

• What type of blood is transported from the heart to the lungs?

  Deoxygenated blood
• Why does the heart need its own supply of blood?


  To ensure it receives oxygen and nutrients
• What does the circulatory system transport?


  Oxygen and nutrients
• What happens to deoxygenated blood when it reaches the lungs?


  It gains oxygen and becomes oxygenated
• Where does oxygenated blood go after leaving the lungs?


  To the rest of the body
• What occurs to oxygenated blood in the tissues?


  It gives up its oxygen and becomes deoxygenated
• What is the role of the pulmonary artery?


  To carry deoxygenated blood to the lungs
• How does blood flow into the heart?

  Via the vena cava
• What are the two main chambers of the heart mentioned?

  Atria and ventricles
• What is the function of the pacemaker in the heart?


  To regulate the heartbeat
• How does the heart maintain a steady beat?

  Through impulses from a group of cells in the pacemaker
• What type of blood do arteries carry?


  Oxygenated blood
• What type of blood do veins carry?


  Deoxygenated blood
• What is the primary function of veins?


  To carry blood back to the heart
• What happens to the heart when it contracts?


  It pumps blood out into the arteries
• What are the main components of the circulatory system?


  • Heart
  • Blood vessels (arteries, veins, capillaries)
  • Blood
• Describe the blood flow through the heart.

  1. Deoxygenated blood enters the heart via the vena cava.
  2. Blood flows into the right atrium.
  3. It moves to the right ventricle.
  4. Blood is pumped to the lungs via the pulmonary artery.
  5. Oxygenated blood returns to the left atrium.
  6. It flows into the left ventricle.
  7. Blood is pumped to the body through the aorta.
• What are the main components of the circulatory system?


  The heart, blood vessels, and blood
• What type of circulatory system do humans have?


  Humans have a double circulatory system
• What are the two circuits in the human circulatory system?


  • Circuit 1: heart (right ventricle) → lungs → heart
  • Circuit 2: heart (left ventricle) → rest of body → heart
• What type of blood is carried by the pulmonary artery?


  Deoxygenated blood
• What type of blood is carried by the vena cava?


  Deoxygenated blood
• What type of blood is carried by the aorta?


  Oxygenated blood
• What are the roles of the right and left sides of the heart?

  • Right side: pumps deoxygenated blood to the lungs
  • Left side: pumps oxygenated blood to the rest of the body
• What is the function of valves in the heart?


  They stop blood from flowing backwards
• Where are the "Pacemaker" cells located in the heart?


  In the right atrium wall
• What is the role of the coronary arteries?


  They supply the heart muscle with oxygenated blood
• What is an artificial pacemaker?


  An electrical device that controls heartbeat
• When is an artificial pacemaker used?


  If the natural pacemaker cells don't work properly
• What does the circulatory system carry to every cell in the body?


  Food and oxygen
• Besides delivering food and oxygen, what is another function of the circulatory system?


  It collects waste products for removal from the body
• What are the main components of the circulatory system?


  • Heart
  • Blood vessels
  • Blood
• What type of circulatory system do humans have?


  Humans have a double circulatory system
• What are the two circuits of the human double circulatory system?


  1. Right ventricle pumps deoxygenated blood to the lungs
  2. Left ventricle pumps oxygenated blood to the body organs
• What does the right ventricle do in the circulatory system?


  It 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?


  It pumps oxygenated blood around all the other organs of the body
• What happens to oxygen in the blood at the body cells?


  The blood gives up its oxygen
• What is the primary function of the heart?


  To pump blood around the body
• What are the walls of the heart mostly made of?

  Muscle tissue