What is plasma in the blood? - Yellow liquid that carries blood cells, proteins and dissolved substances around the body, What are red blood cells? - Biconcave cells that have haemoglobin - carry oxygen, Name the pigment found in red blood cells that binds to oxygen. - Haemoglobin, Which organ system transports substances to and from body cells? - Circulatory system, State the functions of white blood cells. - Engult pathogens, produce antibodies and antitoxins, How does being biconcave help red blood cells with their function? - Increase SA:V for efficient diffusion, How is not having a nucleus good for red blood cells? - More space to pack more haemoglobin, State the function of platelets. - Blood clotting,

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