Biology · Transport

The pressure within the capillaries causes a continuous leakage of the fluid from the blood into the spaces that surround the capillaries and tissues.the fluid known as the interstitial fluid Consists primarily of water ,in which dissolved nutrients.hormones,gases,wastes, glucose ,WBCs and small proteins are present .Tissue fluid is important for the exchange of substances between the blood and the cells.fibrinogen is a large protein and cannot squeeze through the holes of the capillary wall. Ref ptb page 318.

White blood cells (WBCs) can be found in tissue fluid as they play a role in immune response and can move through capillary walls.

Glucose is a small molecule that easily diffuses through capillary walls and is present in tissue fluid, providing energy to cells.

Amino acids, like glucose, are small enough to pass through capillary walls and are found in tissue fluid, aiding in cell nutrition and repair.

Fibrinogen is a large plasma protein involved in blood clotting and is too large to pass through capillary walls into tissue fluid.