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LYMPHATIC SYSTEM The interstitial fluid surrouding the cells is formed when blood is filtred under pressure from capillaries at the arterial end. The fluid part of the blood or plasma is forced out with ions and small molecules minus the larger plasma proteins and blood cells. This interstitial fluid provides cells with nourishment, oxygen, removes wastes and carbon di-oxide. Thus the fluid contains ions, nutrients in the form of glucose, amino acids, hormones, low molecular weight proteins, wastes in the form of urea, carbon di-