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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