Ch5: Circulatory System

• Blood cells:

  Red blood cells - contains haemoglobin, carries oxygen

  White blood cells - Destroys bacteria by eating it, produces antibodies which attack bacteria

  Platelet - Clots blood when a vessel is torn/damaged
• Blood vessels:

  Artery - Has thick walls, carries blood away from the heart

  Vein - Has thin walls, carries blood toward the heart, has valves to prevent blood flowing backward

  Capillary - One cell thick/Very thin walls, allows substances to pass into cells
• The Heart:

  Vena Cava - carries blood from body to heart

  Right atrium - Receives deoxygenated blood from vena cava

  Right ventricle - transfers blood from right atrium to pulmonary artery

  Pulmonary artery - carries blood from right ventricle to lungs (for oxygen)

  Pulmonary vein - carries blood from lungs to left atrium

  Left atrium - receives oxygenated blood from pulmonary vein

  Left ventricle - transfers blood from left atrium to aorta

  Aorta - sends blood throughout the body