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The components of the blood

The components of the blood. and their jobs. What is blood made up of?. Red blood cells White blood cells Platelets Plasma Breakdown products of digestion, such as glucose, fatty acids and amino acids Dissolved mineral salts Carbon dioxide Urea hormones. What is plasma?.

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The components of the blood

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  1. The components of the blood and their jobs

  2. What is blood made up of? • Red blood cells • White blood cells • Platelets • Plasma • Breakdown products of digestion, such as glucose, fatty acids and amino acids • Dissolved mineral salts • Carbon dioxide • Urea • hormones

  3. What is plasma? • Plasma is the liquid part of the blood which carries everything else. • Plasma is a straw-yellow coloured liquid • If everything in plasma was removed, plasma would look like this

  4. What do the different parts of blood look like under a microscope? Red blood cells White blood cells

  5. What is the job of red blood cells? • They have a round, flat disc shape for a large surface area • They do not have a nucleus • They contain haemoglobin which combines with oxygen in areas of high concentration to form oxyhaemoglobin • Oxygen + haemoglobin oxyhaemoglobin • Red blood cells carry oxygen to the cells of the body for use in respiration

  6. What do white blood cells do? • White blood cells help the body to fight invading bacteria • White blood cells will engulf and ingest invading bacteria

  7. They produce antibodies which can recognise and fight bacteria They produce antitoxins which neutralise the toxins (poisons) that bacteria produce, which make us feel ill Other important jobs of the white blood cells:

  8. What do platelets do? • Platelets are fragments of cells • The job of platelets is to help blood clot and form a scab • The platelets are involved in the formation of fibrin, which is needed for clotting blood • This is useful for stopping bleeding, and for preventing germs from entering the body through the cut

  9. Summary of the composition of blood

  10. Questions on the blood • What part of blood carries oxygen to cells? • Why are red blood cells flat disc-shaped? • What is the job of platelets? • What do white blood cells do? • Describe how a white blood cell carries out its job. • What is the straw-coloured liquid which carries all the other parts of blood called?

  11. More questions on blood • Name cell A • Name cell B A B

  12. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com 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.

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