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Venules. By: Riley, Chirag , Manjot and Arsalan. How big are venules ? . Venules are very small; they are smaller than veins but larger than capillaries. Total Cross-Sectional Area. Same total cross-sectional area as the arterioles and are tied for the second lowest.
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Venules By: Riley, Chirag, Manjot and Arsalan
How big are venules? • Venules are very small; they are smaller than veins but larger than capillaries.
Total Cross-Sectional Area • Same total cross-sectional area as the arterioles and are tied for the second lowest.
Blood Velocity in Venules • Blood velocity slightly increases as the blood flows from the capillaries to the venules.
Blood Pressure in Venules • Blood pressure in venules is minimal (20-0mm Hg). This is because blood pressure drops the further you go away from the heart.
Direction of Blood Flow • Venules take blood from the capillary beds to the heart. venule Blood Flow Red Blood Cells Capillary
Valves • Yes, they prevent the backward flow of blood.
Walls of Venules • Venules have the same three layers as arteries, but there is less smooth muscle and connective tissue. (walls are thinner compared to arteries).
Oxygenated or Deoxygenated • Blood in venules are deoxygenated. V = VenuleA = Arteriole