circulatory system- The heart

• What does the circulatory system do?

  carry food and oxygen to cells in the body and carries waste products to where they can be removed from the body
• What is the circulatory system made up off?

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

  A double circulatory system
• What does the right ventricle do?

  pumps deoxygenated blood to the lungs to take in oxygen then blood returns to heart
• What does the left ventricle do?

  pumps oxygenated blood around all the organs of the body
• What does the heart contract to do?

  pump blood around the body
• what is the heart?

  a pumping organ
• What are the walls of the heart made out off?

  muscle tissue
• what does the heart have to prevent the backflow of blood?

  valves
• What do valves do?

  Make sure blood flows in the right direction and prevents the backflow of blood
• What are the four chambers off the heart?

  1. left ventricle
  2. right ventricle
  3. left atrium
  4. right atrium
• explain the cycle of how blood is pumped around the body by the heart.

  1. blood flows into atria from vena cava and pulmonary vein
  2. atria contract pushing blood into ventricles
  3. ventricles contract forcing blood into pulmonary artery and aorta and out of the heart
  4. blood flows to the organs through arteries and return through veins
• What does the heart have beginning with p?

  pacemaker
• Where is the pacemaker found?

  right atrium
• What do pacemaker cells produce?

  electrical impulses which cause muscle cells to contract
• What is an artificial pacemaker used for?

  to control heartbeat
• Why would someone need an artificial pacemaker?

  If they have an irregular heartbeat
• what is an artificial pacemaker?

  A little device planted under skin which has a wire going to the heart
• What does the artificial pacemaker produce?

  An electric current to keep the heart beating regularly