The<unk>  is the blood flow through blood vessels smaller than 100 µm (i.e. arterioles, capillaries, and venules), this contrasts with<unk> , which transports blood to and from the organs.
The main functions of the<unk>  are transporting blood cells and substances to/from the tissues, and acting as body coolant in thermoregulation processes.
It also contributes to tissues color and stiffness.
Diffusion is the capillary exchange of substances across the endothelial cells membranes.
Microcirculation
Blood flow
Cerebral circulation
Renal blood flow
Thermoregulation
Hemostasis
Oxygenation
Heat transfer