I Plasma Straw-colored liquid consisting of water and dissolved solutes Sodium ion is the major solute of the plasma in terms of its Plasma(55%) concentration In addition to Nat, plasma → Buffy coat, composed of white blood cells contains Red blood cells and platelets 45% many other salts and ions as well as organic molecules such as metabolites, hormones, enzymes antibodies, and other proteins5 I Plasma ➢ Straw-colored liquid consisting of water and dissolved solutes. ➢ Sodium ion is the major solute of the plasma in terms of its concentration. ➢ In addition to Na+ , plasma contains ➢ many other salts and ions, ➢ as well as organic molecules such as metabolites, hormones, enzymes, antibodies, and other proteins