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Capillary walls & Cell membranes
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.
only metabolic wastes out of the capillary
The arterial and capillary walls are incredibly strong. This is true otherwise you would be bleeding just by tapping yourself.
500
they have skinny walls
The most important force causing net water flow across capillary walls is the hydrostatic pressure of capillary blood. These walls are composed of a single layer of curved cells.
Capillary walls receive oxygen in the lungs by a process known as diffusion.
neutrophils
Osmosis
diapedesis