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. Other important jobs of the white blood cells:
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

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

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