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What is Lumen in Biology?
A lumen in biology refers to the inside space of a tabular structure such as an intestine or artery. Lumen comes from a Latin word that means “an opening”. For example, the endoplasmic reticulum lumen refers to the space inside the folds of ER.
It refers to the vessel’s interior as a central space in a vein or artery through which the blood flows.
A lumen can also be the inside space of a cellular structure such as the endoplasmic reticulum.
It refers to:
- Vessel’s interior
- Pathways of bronchi in lungs
When talking about cell biology, a lumen is a membrane-defined space that is found inside several organelles.
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