plasma /plaz′mə/ [Gk, something formed] , the watery light yellow fluid part of the lymph and the blood in which leukocytes, erythrocytes, and platelets are suspended. Plasma is made up of water, electrolytes, proteins, glucose, fats, bilirubin, and gases and is essential for carrying the cellular elements of the blood through the circulation, transporting nutrients, maintaining the acid-base balance of the body, and transporting wastes from the tissues. Plasma and interstitial fluid correspond closely in content and concentration of proteins. Therefore plasma is important in maintaining the osmotic pressure and the exchange of fluids and electrolytes between the capillaries and the tissues. Compare serum.
