1. It is composed of plasma and blood cells.
2. It consists of 55% plasma and 45% blood cells.
3. Its relative importance is 1.05-1.06.
4. Its pH is 7.35-7.45 (average 7.40).
5. Temperature 36-38০C.
6. 7-8% or 12th of the total body weight is blood.
7. It is red.
8. It is highly alkaline.
9. It is salty in nature.