arterioles
Capillaries
The capillaries flow from an artery to a vein.
Capillaries do not have valves to regulate blood flow. Veins are the vessel of the circulatory system that have veins to regulate blood flow.
Arterioles are the most important type of blood vessel in regulating vascular resistance. They are able to constrict or dilate, controlling the flow of blood to various tissues and organs, therefore playing a critical role in regulating blood pressure and overall blood flow in the body.
the answer can be veins or ateries or venules or capillaries... sorry i really do not know the answer... hehehe... :)
the answer can be veins or ateries or venules or capillaries... sorry i really do not know the answer... hehehe... :)
Blood capillaries are surrounded by a layer called the basement membrane, which provides structural support and acts as a barrier between the capillaries and surrounding tissues. Pericytes, contractile cells that regulate blood flow and vessel stability, may also be found surrounding blood capillaries.
Sympathetic nerve fibers are the most important in regulating blood flow, as they can cause vasoconstriction or vasodilation in blood vessels. These fibers release norepinephrine which can act on smooth muscle cells in the blood vessel walls to control blood flow throughout the body.
Proceeding downstream from the aorta, branching of arterial vessels increases total cross-sectional area and thus results in diminished velocity of blood flow from the aorta to the capillaries. Velocity increases from the capillaries to the large veins with the confluence of vessels and the resulting decrease in total cross-sectional area. :)
Blood does not move faster through the capillaries. Blood flow is slowest in the capillaries.
Resistance to blood flow depends mainly on the diameter of blood vessels and the viscosity of blood. Smaller vessel diameter and higher blood viscosity lead to increased resistance, which can affect blood pressure and flow rates.
Blood flow in the center of a large vessel is faster because the walls of the blood vessel may have a buildup of cholesterol on them.