B7 tissue fluid help

how is tissue fluid formed? (what should i write in the exam) perfect answer plz

Blood enters at a high pressure from the artery with a high concentration of oxygen. This pressure pushes the plasma out of the capillary where it forms tissue fluid. There is a high concentration of oxygen and glucose in the blood and these diffuse from a high concentration in the blood to a low concentration in the cells. The pressure decreases down the capillary. Waste chemicals (eg carbon dioxide and urea) then diffuse out from a high concentration in the cells to a low concentration in the blood in the capillary. These waste products are then carried away. At the end of the capillary, the blood is under low pressure as it goes to a vein.

In terms of just the tissue fluid
Pressure in the blood forces the plasma out through the capillary wall, to form tissue fluid.