microcirculation

• microcirculation: is the blood flow through blood vessels smaller than 100 micrometer (arterioles, capillaries, and venules)
• blood flow coming from the arterioles to the capillaries, at the capillaries we have the exchange and then leave to the venules.
• function of the microcirculation: transporting blood cells and substance to/from the tissues. 
• vasomotion: is theregulationg of blood flow to the capillaries depend on the tissue need by opening and closing of the precapillary sphincter
• oxygen (O2) is the most important factor affects precapillary sphincter, when the tissues need O2, the precapillary will dilate and relax vice versa.