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what is lumen?
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Lumen: A luminous term referring to the channel within a tube such as a blood vessel or to the cavity within a hollow organ such as the intestine. Lumen is a luminous term because it is Latin for light, including the light that comes through a window. When a hollow organ is cut across, you can see light through the space that has been opened. So the word "lumen" came to mean this space.
Explanation:
lumen is a part of our body
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Explanation:
lumen is the hollow are in the alimentary canal
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