1. funtction
   1. food & oxygen to every cell
   2. waste products
      1. carbin dioxide
      2. urea
2. Double Circulation System
   1. mammals and birds
   2. 1/ heart
      1. two pumps
      2. right side
         1. deoxygenated blood to lungs
            1. cellect oxygen
            2. remove carbon dioxide
      3. left side
         1. oxygenated blood round body
   3. 2/ Arteries
      1. blood
         1. away from heart
         2. high pressure
         3. oxygenated blood
         4. aorta
            1. artery out of heart
   4. 3/ Pulmonary
      1. artery
         1. deoxygenated blood to lungs
      2. vien
         1. oxygenated blood from lungs
      3. NB reverse to normal artery / vien roll
   5. 4/ capillaries
      1. split form arteries
      2. carry blood to every cell
      3. diffusion
         1. food & oxygen to body tissue
         2. carbon dioxide and waste materials away
      4. walls one cell thick
      5. microscope needed to see them
   6. 5/ veins
      1. collect used blood
      2. back to heart
      3. low pressure
      4. vena cava
         1. vein into heart
3. single ciculation system
   1. fish
   2. blood
      1. straight from
         1. heart - gills (lungs) - rest of body
4. other circulation systems
   1. worms
      1. 5 pairs of hearts
   2. flatworms
      1. no circulation system
5. Arteries, Veins, Capillaries
6. Blood
   1. white blood cells
   2. red blood cells
      1. carry oxygen
         1. lungs to cells
      2. doughnut shape
         1. large surface are
            1. absorb oxygen
      3. no nucleus
      4. haemoglobin
         1. in lungs
            1. Haemoglobin + oxygen = oxyhaemoglobin
         2. tissues
            1. reverse of above happens
   3. plasma
      1. liquid
      2. carries everything in blood
         1. red
         2. white
         3. platelets
         4. glucose
         5. amino acids
         6. carbon dioxide
            1. organs to lungs
         7. urea
            1. liver to kidneys
         8. hormones
         9. antibodies
         10. antitoxins
         11. produced by white blood cell
         12. soluble absorbed from gut
   4. platelets
      1. fragments of cells
      2. clots blood at a wound