name the blood vessels with narrow lumen and no valves
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name the blood vessels with narrow lumen and no valves
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Answer:
veins
Explanation:
this is the answer
Explanation:
Capillaries have the smallest lumen but relative to their size the lumen is quite large. This is because capillaries are where exchange of oxygen, nutrients and waste products occur between blood and tissues so they have evolved to have the greatest surface area to volume ratio to increase efficiency of the exchange.