Veins are able to constrict because of the ____________________ tissue in their walls.
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Q163: In fetal circulation, the ductus arteriosus permits
Q164: If venous return decreases, cardiac output will
Q165: The respiratory pump is especially important for
Q166: In fetal circulation, the _ permits blood
Q167: In fetal circulation, blood flows from the
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
Q173: The flow of venous return is kept
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