The heart

• Superior vena cava

  A large vein that carries deoxygenated blood to the right atrium from the upper parts of the body.

  
• Inferior vena cava


  A large vein that carries deoxygenated blood to the right atrium from the lower half of the body.

  
• Right Atrium

  Right upper chamber of the heart. It receives deoxygenated blood from the body through the inferior vena cava and the superior vena cava

  
• Left Atrium

  Left upper chamber of the heart. It receives oxygenated blood from the lungs via the pulmonary vein.

  
• Right Ventricle

  Right lower chamber of the heart. It pumps the blood into the pulmonary artery to the lungs.

  
• Left Ventricle

  Left lower chamber of the heart. It pumps the blood into the aorta and around the body.

  
• Septum

  Muscular wall that separates the left and right sides of the heart.

  
• Valve

  Flaps between the atriums and the ventricles Prevents the back-flow of blood from the ventricle to the atrium.

  
• Pulmonary Artery

  Blood vessel that carries deoxygenated blood from the right ventricle of the heart to the lungs

  
• Pulmonary Vein

  Blood vessel that carries oxygenated blood from the lungs to the left atrium of the heart.

  
• Aorta

  Biggest and longest artery in the body. It carries oxygenated blood from the left ventricle of the heart to the body.

  
• Vein

  A blood vessel that usually carries deoxygenated blood; has a large lumen and valves

  
• Artery

  A blood vessel that usually carries oxygenated blood, has a small lumen, and carries blood at a high pressure
• Capillaries

  Blood vessels which have a narrow lumen to get close to body cell; are one cell thick to increase surface area for more efficient diffusion; have no valves.