B3 Unit 2

How are dissolved materials transported around the body?

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The Blood

Blood plasma transports:

·        Carbon dioxide from the organs to the lungs.

·        Soluble products of digestion from the small intestine to other organs.

·        Urea from the liver to the kidneys.

  • Red blood cells transport oxygen from the lungs to the organs.
  • In the lungs haemoglobin combines with oxygen to form oxyhaemoglobin. In other organs oxyhaemoglobin splits up into haemoglobin and oxygen.
  • Substances needed by cells in the body tissues pass out of the blood, and substances produced by the cells pass into the blood through the walls of the capillaries.
  • There are two separate circulation systems, one to the lungs and one to all the other organs of the body.

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