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Red blood cells

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Red blood cells are produced in the marrow of bones, E.g. Ribs, breastbone, long bones in arms and legs and the vertebrae.
Red blood cells are small. 5 million are found in 1 cubic metre of the blood. They consist of a refexible membrane containing many molecules of red protein called haemoglobin.
Red blood cells are broken down and replaced at the rate of 3 million cells per second.
Red blood cells cannot repair themselves and they can only live for four months

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Plasma

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Yellow, ~ 55% of blood.
Made of water, protein and dissolved materials that are transported.
Plasma is the liquid part of the blood.
Protein present: antibodies, clotting proteins
Functions of plasma: transport dissolved materials such as glucose, amino acids, vitamins, minerals, salts, urea and hormones. Plasma also carries heat.
SERUM is plasma from where the clotting protein have been removed.
Serum has no clotting protein but contains the other plasma-soluble materials including antibodies.

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Leukaemia is a form of càncer where white blood cells are produced to rapidly this crowds out existing cells and can cause anaemia and increased risk of infection
-has no defined shape
-white blood cells have a ratio of 1:700 against red blood cells
- they are larger than red blood cells
- they are made in bone marrow

There main function is to defend the body from infection and fight infections that have already entered the body