capillary permeability theory

The capillary permeability theory describes how substances move between blood and surrounding tissues through tiny blood vessels called capillaries. Capillaries have small openings that allow nutrients and oxygen to pass into tissues while removing waste products. The permeability, or ease of passage, depends on the size of these openings and the properties of the substances. This process is crucial for maintaining tissue health and fluid balance. Changes in capillary permeability can cause excess fluid or immune cells to leak into tissues, which may lead to inflammation or swelling.