Blood Facts :

1 Your heart beats 30 million times each year.
2 The chambers of the heart each hold about 70mi of blood.
3 Pulse rate average 60 to 100 beats a minute.
4 Blood travels through the capillaries at 1m a second.
5 There are 60,000km of capillaries in your body.
6 Capillaries may be just a hundredth of a millimeter thick.
7 Someone who weighs 75 kg has about 5 liters of blood.
8 Someone who weighs 35kg has 2.5 liters of blood.
9 Someone who weighs 75kg and lives on the high Andes has about 6 liters of blood.
10 A microlitre of blood holds 4-6 million of red blood cells.
11 A microliter of blood holds 5-10,000 white blood cells.
12 A microliter of blob holds 150,000-500,000 platelets.
13 Blood is 60% plasma.
14 Plasma is 90% water.
15 There are 13 blood clotting factors , numbers I-XIII
16 There are 4 blood group: A,O,N and ABO.85% belong to the blood type Rhesus negative