
Lumen
A lumen is present not only in large organs but in much smaller organs, such as blood vessels, and in organ components, such as tubules and ducts. 800x, 1000x

Lumens of tubules
A lumen is present not only in large organs but in much smaller organs, such as blood vessels, and in organ components, such as tubules and ducts. 800x, 1000x

Lumen of small artery
A lumen is present not only in large organs but in much smaller organs, such as blood vessels, and in organ components, such as tubules and ducts. 800x, 1000x