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Lumen (anatomy) facts for kids

Kids Encyclopedia Facts
Gut wall
Cross section of the gut. The lumen is the space in the middle also known as the volume.

In biology, a lumen (plural lumina) is the inside space of a tubular structure, such as an artery or intestine.

Two examples are the interior of a vessel, such as the central space in an artery, vein or capillary through which blood flows or the interior of the gastrointestinal tract.

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Lumen (anatomy) Facts for Kids. Kiddle Encyclopedia.