The passageway, or hollow space, through the digestive tube, is called the the lumen. This is further explained below.
Generally, The lumen is the name given to the route that runs through the hollow area which is the digestive tube.
In conclusion, The amount of light that emanates from a light bulb is measured in lumens. When there are more lumens, the light is brighter, and when there are fewer lumens, the light is dimmer. Lumens are used to measure how much light. What a pound is to a bunch of bananas. Milk is measured in gallons.
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