Inbiology, a lumen (pl.: lumina) is the inside space of a tubular structure, such as an artery or intestine.[1] It comes from Latin lumen 'an opening'.
It can refer to:
Incell biology, a lumen is a membrane-defined space that is found inside several organelles, cellular components, or structures, including thylakoid, endoplasmic reticulum, Golgi apparatus, lysosome, mitochondrion, and microtubule.
Transluminal procedures are procedures occurring through lumina, including:[citation needed]
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