blood plasma [AS, blod + Gk, plassein, to mold] , the liquid portion of the blood, free of its formed elements and particles. Plasma represents approximately 50% of the total volume of blood and contains glucose, proteins, amino acids, and other nutritive materials; urea and other excretory products; and hormones, enzymes, vitamins, and minerals. Compare serum. See also blood, plasma protein, pooled plasma.
