What is the amount of plasma in human blood?

A human  blood contains 55% of plasma.

An average person has about 5 liters of blood of which 55 percent is plasma. 

Characteristics of Plasma 

  • Plasma is the liquid portion of the blood. It is 92 percent water. 
  • Plasma is the straw-colored fluid
  • Plasma is the protein salt solution. The protein helps blood to clot, transport substances through the blood, and perform other functions. 
  • Plasma  contains albumin (the primary protein constituent), fibrinogen (responsible for the clotting of blood) and globulins (including antibodies). 
  • Plasma holds the red blood cells, white blood cells and platelets in the whole blood in suspension. This makes plasma the extracellular matrix of blood cells. 
  • Plasma contains glucose and other dissolved nutrients. 
  • Plasma helps in maintaining pH (acid base) balance in the body, which is critical for the cell function. 
  • It plays a vital role in an intravascular osmotic effect that keeps electrolytes in balanced form and protects the body from infection and other blood disorders. 
  • Plasma transports materials needed by cells and materials that must be removed from cells, including various ions (Na+, Ca2+, HCO3, etc), glucose and traces of other sugars, Amino acids, other organic acids, cholesterol and other lipids, hormones, carbon dioxide, urea and other wastes.
  • Blood serum is blood plasma without clotting factors; in other words, “pure” blood.

Further readings:



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