Blood is composed of 45% cells or formed elements and remaining 55% is liquid intercellular substance of blood is called plasma.
Plasma : 55% of human blood is Plasma .It is homogenious slightly alkaline or pale amber or light yellow colour fluid portion of blood. It contains 90 -92 % water. Beside waer,t are various substances either in floating orsoluable condition are present in it . The albumin -globulin ratio in plasma is 1.5 :1 . According to some, it is 4.8 : 2.3 or approximately 2: 1.