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| The study of blood is known as Haematology |
| The normal volume of blood in an adult human is 4.7 to 5 litres |
| Haemoglobin is a protein in red blood cells that carries oxygen to other cells in your body; it contains iron which combines with oxygen to give our blood, a red color. |
| Blood is purified mainly by lungs which remove gaseous impurities like CO2 and kidneys which remove other impurities. |
| The drug or chemical which prevents blood from clotting is called anticoagulant. |
| William Harvey was the first scientist to describe accurately how blood is pumped around the body by the heart. |
| Karl Landsteiner classified the bloods of human beings into A, B, AB, and O groups. |
| Rh blood group system was discovered by Karl Landsteiner and A.S. Weiner. Each blood group type may be Rh positive or negative. |
| The most common blood group type is O+ or O positive |
| The normal blood pressure range is 120/80. The top number (120) is known as the systolic number while the bottom number (80) is known as the diastolic number. |
| Blood pressure is measured by an instrument known as sphygmomanometer. |
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