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What is blood? What is the normal quantity of blood in an adult human being?

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1. Blood is the fluid connective tissue that circulates in the body. 

2. Blood is derived from mesoderm. 

3. It is bright red, slightly alkaline fluid having pH about 7.4. It is salty, viscous fluid heavier than water. 

4. The average sized adult has about 5 litres of blood in his/her body which constitutes about 8% of the total body weight.

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