Blood 2, Cells, structure and function of red and white blood cells
Red blood cells are erythrocytes
The function of the erythrocytes is to carry oxygen from lungs to tissues and
carbon dioxide from tissues to lungs. The percentage of blood which is composed
of red cells is termed the haematocrit; this may be lowered in some forms of
anaemia. Red cells are biconcave discs. This shape provides a large surface area
for gaseous exchange and also gives the cell flexibility. Some capillaries are so
small the red cells have to squeeze through by deforming their shape. Red cells are
about 7 micrometres in diameter (i.e. 7 one thousandths of a millimetre). Every
cubic millimetre (mm3) of blood contains about 5 million red blood cells.
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