Tissue Fluid

• Fluid containing water, glucose, amino acids, fatty acids, ions and oxygen
• Tissue fluid is formed via capillaries squeezing out liquid due to high hydrostatic pressure (ultrafiltration), with only RBCs, WBCs and large proteins remaining in capillaries
• Water is reabsorbed into the blood via osmosis due to large molecules lowering water potential, due to oncotic pressure, some molecules are pushed back into capillaries as well
• Lymphatic System carries remaining fluid not pushed back into capillaries through the system and drains back into the blood via the subclavian vein
• Lymph Nodes produce antibodies to prevent bacteria from entering the fluid as part of the immune defence system