The flow of venous return is kept to one direction only by the ____________________ in the veins.
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Q168: Veins are able to constrict because of
Q169: In fetal circulation, the umbilical arteries carry
Q170: In fetal circulation, the purpose of the
Q171: In fetal circulation, blood in the umbilical
Q172: The skeletal muscle pump is especially important
Q174: In fetal circulation, the foramen ovale permits
Q175: The elasticity of the large arteries permits
Q176: Venous return is the amount of blood
Q177: In fetal circulation, the vessel that takes
Q178: The large arteries are elastic and are
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