Circulatory System

• Blood


  Transports substances from and to the heart and body cells
• What blood transports


  • Oxygen
  • Carbon Dioxide
  • Nutrients
  • Waste
• Functions of blood


  • Transports O2, CO2, Nutrients and Waste
  • Fights infection
  • Temperature control
• Tissue


  Group of cells of similar function
• Red blood cell


  • Bi-concave in shape
  • Carries oxygen
  • Contains haemoglobin
• White blood cell


  • Irregular shape
  • Fights infection
• Platelets


  • Fragments of cells
  • Help clot the blood
• All cells float in the liquid part of the blood called Plasma. Nutrients, waste and hormones are also carried in plasma
• Artery


  • Carries blood away from heart
  • Carries oxygenated blood
• Vein


  • Carries blood to the heart
  • Carries deoxygenated blood
  • Have valves to prevent backflow
• Capillary


  • Only one cell layer thick to allow for diffusion of nutrients, gases, wastes etc
• Heart


  • Made from cardiac muscle - muscle that never tires
• Blood vessels


  • Pulmonary Artery = Carries deoxygenated blood to the lungs.
  • Aorta = Carries oxygenated blood to the body
  • Coronary Artery = Carries nutrients and oxygen from the aorta to the heart muscle
  • Pulmonary Vein = Carries oxygenated blood to the heart
  • Vena Cava = Carries deoxygenated blood to the heart
• Exercise needs energy


  • Energy is from respiration
  • Respiration needs oxygen
• Blood delivers food and oxygen to the body for respiration


  • Blood removes carbon dioxide from cells to lungs
  • Blood absorbs nutrients from the intestine