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2. The blood circulation system consists of...

  • the heart, blood and blood vessels
  • the blood, veins and arteries

3. How much blood does the average person have?

  • 5.2 - 5.5 litres
  • 4.7 - 5.0 litres
  • 3.5 - 3.8 litres

4. What are stents used for?

  • To open up arteries and prevent blood clotting
  • To let the blood flow faster

5. Select an adaption of a red blood cell:

  • Small surface area
  • Biconcave
  • Small amount of hameoglobin
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