hollieclark2013
hollieclark2013
08-06-2014
Biology
contestada
Why don't arteries need valves
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lawrencecilia
lawrencecilia
08-06-2014
Arteries don't need valves because the blood that is flowing through them is at a high pressure.
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trickiwoo
trickiwoo
08-06-2014
the blood is always flowing through them at high pressures
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