The outer layer of the wall of a vein is thin because ____________________ in veins is low.
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Q132: Fibrous connective tissue forms the _ layer
Q133: An arterial anastomosis provides an alternate pathway
Q134: A venous anastomosis provides an alternate pathway
Q135: In veins, backflow of blood is prevented
Q136: The layer of the wall of an
Q138: Capillaries are the site of _ between
Q139: In the wall of a vein, the
Q140: Capillaries are made of _ tissue, and
Q141: The circle of Willis is formed by
Q142: One purpose of portal circulation is to
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