The Life Stream in our Bodies   What Happens When I give Blood?  
 

The blood is the life stream. It carries food and energy to all parts of the body; it scavenges the waste material of living which would otherwise poison the living creature; it helps to keep body temperature within the narrow limits in which cells can stay alive; it fights off the unceasing attacks of the bacteria of disease and decay. When the blood ceases to flow, life ends if the supply of blood to the brain stops for only a second, the person becomes unconscious.

Blood normally accounts for about 1/13th of a man's total weight. A man weighing 70 Kg has about 5.4 Kg of blood. Blood is pumped by the heart into the arteries which branch and become smaller and smaller , like the branches and twigs of a tree, into capillaries ( from Latin, ‘capillus' means a hair) The blood leaves the capillaries for minute veins which become bigger veins and returns to the lungs and heart to start its journey again.

 

 

 

A tiny drop of blood is taken from your fingertip. This allows us to check your haemoglobin levels and ensure that giving blood won't make you anaemic.

If all is well, you will be able to donate blood. You will donate about 470ml of blood - this amount of blood is quickly replaced by your body. Learn more about how the body replaces blood.

Once you have given blood, you should have a short rest before being given some refreshments usually a drink and biscuits. All in all giving blood shouldn't take more than an hour.

 
         
         
 
 
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