The normal blood pressure range is 120/80 mm. The top number (120) is known as the systolic number while the bottom number (80) is known as the diastolic number.
The blood pressure is measured by an instrument known as sphygmomanometer.
The study of blood is known as Haematology.
The normal volume of blood in an adult human being is 4.7 to 5 litres.
William Harvey was the first scientist to describe accurately how blood is pumped around the body by the heart.
Karl Landsteiner classified the blood of human beings into A, B, AB, and O.
Blood is purified mainly by lungs which remove gaseous impurities like CO2 and kidneys which remove other impurities.