- the blood, blood vessels and heart make up the human circulatory system which transports substances to and from the body cells
- plasma has blood cells suspended in it and transports proteins and other chemicals around the body
- red blood cells contain haemoglobin that binds to oxygen to transport it from the lungs to the tissues
- white blood cells help to protect the body against infection
- platelets are cell fragments that start the clotting process at wound sites
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