circulatory system

• the valves prevent blood flowing backwards through the heart
• the valves prevent backflow of blood
• the coronary arteries supply oxygenated blood to the heart muscle itself
• the right atrium is on the top left of the image of a heart
• the right ventricle is on the bottom left of the image of a heart
• the left atrium is on the top right of an image of a heart
• the left ventricle is on the bottom right of an image of a heart
• deoxygenated blood flows into the right atrium from the body via the vena cava
• oxygenated blood flows into the left atrium from the lungs
• the two atria contract together and push the blood into the ventricles
• the ventricles contract and push the blood back out of the heart
• right ventricle pushes deoxygenated blood to the lungs via the pulmonary artery
• left ventricle pushes oxygenated blood back to the body via the aorta
• deoxygenated blood flows into the right atrium via the vena cava
• oxygenated blood flows into the left atrium via the pulmonary vein
• pacemaker is a group of cells in the right atrium that keeps the heart beat steady via electrical impulses
• an artificial pacemaker is placed beneath the skin above the heart and has a wire into the right atrium that gives out electrical impulses
• artery carries blood away from the heart
• vein carries blood to the heart
• order

  • vena cava
  • right atrium
  • right ventricle
  • pulmonary artery
  • lungs
  • pulmonary vein
  • left atrium
  • left ventricle
  • aorta
  • body
• coronary arteires

  branch off the aorta and surround the heart. This gives the heart it’s own blood supply
• Left side of heart is what kind of blood?

  oxygenated
• Right side of heart is what kind of blood?

  deoxygenated
• Blood comes into the heart in which two places?

  Vena cava and pulmonary vein
• Blood leaves the heart in which two places?

  Pulmonary artery and the aorta