Lumen (anatomy) - Citizendia

Artery anatomy, showing lumen

For other uses, see Lumen.

General structure of the gut wall showing the lumen in the middle

A lumen (Lat. lūmen, an opening or light) (pl. lumina) is an inner space, lining or cavity.

The interior of a vessel within the body, such as the small central space in an artery or vein, or any of their relating vessels through which blood flows. Arteries are Blood vessels that carry blood away from the Heart. In the Circulatory system, a vein is a Blood vessel that carries Blood back toward the Heart (as opposed to Artery, a blood vessel Blood is a specialized Bodily fluid that delivers necessary substances to the body's cells ��such as nutrients and oxygen—and transports Waste products

The inner membrane space of a Thylakoid, endoplasmic reticulum, Golgi apparatus, or microtubule. The inner membrane is the Biological membrane (phospholipid bilayer of an Organelle or Gram-negative Bacteria that is within an Outer A Thylakoid is a membrane-bound compartment inside Chloroplasts and cyanobacteria. The endoplasmic reticulum (Greek endo = "within" (prefix plásma = "formed entity" Latin reticulum = "little net" or ER, is an Organelle The Golgi apparatus (also called the Microtubules are one of the components of the Cytoskeleton. They have a diameter of 25 nm and length varying from 200 nanometers to 25 micrometers

On a larger scale it may refer to:

References

^ Adds, John; Erica Larkcom, Ruth Miller. A bronchus (plural bronchi, adjective bronchial) is a caliber of airway in the Respiratory tract that conducts air into the Lungs No Gas lung is the essential Respiration organ in air-breathing Animals including most Tetrapods a few Fish and a few Snails The most primitive The collecting duct system of the Kidney consists of a series of tubules and ducts that connect the Nephrons to the Ureter. The vagina (from Latin, literally " Sheath " or " Scabbard " is a fibromuscular tubular tract leading from the Uterus Exchange and transport, energy and ecosystems. Nelson Advanced science (Nelson Thornes web site), 16. ISBN 0-7487-7487-4.