Increased capillary permeability allows leukocytes to pass from the vessels into tissues
Diapedesis occurs when capillary permeability increases allowing the migration of monocytes through the capillary walls into tissues. Once there, monocytes are considered macrophages. This allows for full macrophage activity.
Diapedesis is the process by which white blood cells move from the bloodstream to tissues by squeezing through gaps in the vessel walls. This is an important step in the immune response, allowing white blood cells to reach sites of infection or inflammation to help fight off pathogens.