the heart

• Blood

  Carries oxygen and nutrients
• Blood vessels

  Hold the blood
• Heart


  Pumps the blood to keep it moving through the vessels
• Circulatory system

  Deoxygenated blood from heart to lungs, oxygenated blood from lungs to rest of body
• Atria


  Top chambers of the heart
• Ventricles


  Bottom chambers of the heart
• • (left atrium) to left ventricle

  • via {bicuspid/ av} valves

  • to aorta which takes blood to body

  • return of blood via vena cava

  • to right atrium

  • to right ventricle

  • via {tricuspid/ av} valve

  • to pulmonary artery to lungs

  • valve prevents backflow of blood