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What are the 4 Main Components of Blood?
red blood cells
white blood cells
platelets
plasma
How is Blood Volume divided?
45% is red and white blood cells and platelets
55% is plasma
Characteristic of Red Blood Cells?
they contain a pigment called haemoglobin and it attracts oxygen that gives these cells their bright red colour
Characteristic of White Blood Cells?
they can pass through capillary walls to fight disease by absorbing them
Characteristic of Platelets?
they cause blood to clot
Characteristic of Plasma?
they are a clear yellowish fluid 90% of which is water
they carry blood cells and the gases attached to them to muscles and organs