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The components of the blood (f)


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The components of the blood (f)

  1. 1. The components of the blood and their jobs
  2. 2. What is blood made up of? <ul><li>Red blood cells </li></ul><ul><li>White blood cells </li></ul><ul><li>Platelets </li></ul><ul><li>Plasma </li></ul><ul><li>Breakdown products of digestion, such as glucose, fatty acids and amino acids </li></ul><ul><li>Dissolved mineral salts </li></ul><ul><li>Carbon dioxide </li></ul><ul><li>Urea </li></ul><ul><li>hormones </li></ul>
  3. 3. What is plasma? <ul><li>Plasma is the liquid part of the blood which carries everything else. </li></ul><ul><li>Plasma is a straw-yellow coloured liquid </li></ul><ul><li>If everything in plasma was removed, plasma would look like this </li></ul>
  4. 4. What do the different parts of blood look like under a microscope? Red blood cells White blood cells
  5. 5. What is the job of red blood cells? <ul><li>They have a round, flat disc shape for a large surface area </li></ul><ul><li>They do not have a nucleus </li></ul><ul><li>They contain haemoglobin which combines with oxygen in areas of high concentration to form oxyhaemoglobin </li></ul><ul><li>Oxygen + haemoglobin oxyhaemoglobin </li></ul><ul><li>Red blood cells carry oxygen to the cells of the body for use in respiration </li></ul>
  6. 6. What do white blood cells do? <ul><li>White blood cells help the body to fight invading bacteria </li></ul><ul><li>White blood cells will engulf and ingest invading bacteria </li></ul>
  7. 7. Other important jobs of the white blood cells: <ul><li>They produce antibodies which can recognise and fight bacteria </li></ul><ul><li>They produce antitoxins which neutralise the toxins (poisons) that bacteria produce, which make us feel ill </li></ul>
  8. 8. What do platelets do? <ul><li>Platelets are fragments of cells </li></ul><ul><li>The job of platelets is to help blood clot and form a scab </li></ul><ul><li>The platelets are involved in the formation of fibrin, which is needed for clotting blood </li></ul><ul><li>This is useful for stopping bleeding, and for preventing germs from entering the body through the cut </li></ul>
  9. 9. Summary of the composition of blood
  10. 10. Questions on the blood <ul><li>What part of blood carries oxygen to cells? </li></ul><ul><li>Why are red blood cells flat disc-shaped? </li></ul><ul><li>What is the job of platelets? </li></ul><ul><li>What do white blood cells do? </li></ul><ul><li>Describe how a white blood cell carries out its job. </li></ul><ul><li>What is the straw-coloured liquid which carries all the other parts of blood called? </li></ul>
  11. 11. More questions on blood <ul><li>Name cell A </li></ul><ul><li>Name cell B </li></ul>B A
  12. 12. This powerpoint was kindly donated to is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.