Blood Vessels (Arteries, Veins, and Capilaries)

Blood Vessels (Arteries, Veins, and Capilaries) - a Really...

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AP Biology Blood Vessels (Arteries, Veins, and Capillaries) 1) Arteries a) The part in which the blood pumped from the heart exists b) The thickest epithelium; therefore we measure the pulse from here. c) Highest blood pressure and velocity d) Contain endothelium 2) Veins a) Relatively, thinner than arteries. b) Lower blood pressure and velocity compared to arteries. c) Valves exist since the velocity is slower and the blood can possibly flow back in d) Contain endothelium 3) Capillaries
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Unformatted text preview: a) Really thin epithelium b) Highest surface area c) Low blood pressure d) Lowest velocity for diffusion e) These features are all for transport of substances f) Precapilary sphincter exists Precapilary sphincter = rings of smooth muscle located at the entrance to capillary beds and they control the blood flow. It is controlled by some hormones and nerve impulses. They can either dilate or contract the blood vessels in the body....
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