The blood which flows through our body contains different materials and cells.
Each part of the blood has its own special job to do. The liquid part of our blood is called the plasma and makes up a little more than half the blood.
The plasma is light yellow in colour and thicker than water as many substances are dissolved in it.
These substances are protein, antibodies that fight disease, fibrinogen that helps the blood to clot, carbohydrates, fats and salts, in addition to the blood cells themselves.
The red cells (red blood corpuscles) give the blood it’s colour. There are so many of them in the blood that it make it all look red.
There are about 35 trillion of these tiny, round, flat discs moving around in your body all at once.
As the young red cell grows and takes on adult form in the marrow, it loses its nucleus and builds up more and more haemoglobin.
Haemoglobin is the red pigment, or red blood colour. Red cells live only for about four months and then are broken up, mostly in the spleen.
We red cells are always being formed to replace the cells that are worn out and destroyed.