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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- Spring '11
- Blood vessel, Contain endothelium