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Venule

The smallest venules, composed simply of an endothelial layer, have wider lumens than do capillaries, although they serve similar functions.  Seen here is a venule cut in longitudinal section.  Also present are capillaries and an arteriole with a single layer of smooth muscle cells.  Surrounding the venule is loose connective tissue with elastic fibers cut in cross section.  1000x

Venule <p>The smallest venules, composed simply of an endothelial layer, have wider lumens than do capillaries, although they serve similar functions.  Seen here is a venule cut in longitudinal section.  Also present are capillaries and an arteriole with a single layer of smooth muscle cells.  Surrounding the venule is loose connective tissue with elastic fibers cut in cross section.  1000x</p>

Venule

The smallest venules, composed simply of an endothelial layer, have wider lumens than do capillaries, although they serve similar functions.  Seen here is a venule cut in longitudinal section.  Also present are capillaries and an arteriole with a single layer of smooth muscle cells.  Surrounding the venule is loose connective tissue with elastic fibers cut in cross section.  1000x

 - Endothelium <p>The smallest venules, composed simply of an endothelial layer, have wider lumens than do capillaries, although they serve similar functions.  Seen here is a venule cut in longitudinal section.  Also present are capillaries and an arteriole with a single layer of smooth muscle cells.  Surrounding the venule is loose connective tissue with elastic fibers cut in cross section.  1000x</p>

- Endothelium

The smallest venules, composed simply of an endothelial layer, have wider lumens than do capillaries, although they serve similar functions.  Seen here is a venule cut in longitudinal section.  Also present are capillaries and an arteriole with a single layer of smooth muscle cells.  Surrounding the venule is loose connective tissue with elastic fibers cut in cross section.  1000x

Capillary <p>The smallest venules, composed simply of an endothelial layer, have wider lumens than do capillaries, although they serve similar functions.  Seen here is a venule cut in longitudinal section.  Also present are capillaries and an arteriole with a single layer of smooth muscle cells.  Surrounding the venule is loose connective tissue with elastic fibers cut in cross section.  1000x</p>

Capillary

The smallest venules, composed simply of an endothelial layer, have wider lumens than do capillaries, although they serve similar functions.  Seen here is a venule cut in longitudinal section.  Also present are capillaries and an arteriole with a single layer of smooth muscle cells.  Surrounding the venule is loose connective tissue with elastic fibers cut in cross section.  1000x

Arteriole <p>The smallest venules, composed simply of an endothelial layer, have wider lumens than do capillaries, although they serve similar functions.  Seen here is a venule cut in longitudinal section.  Also present are capillaries and an arteriole with a single layer of smooth muscle cells.  Surrounding the venule is loose connective tissue with elastic fibers cut in cross section.  1000x</p>

Arteriole

The smallest venules, composed simply of an endothelial layer, have wider lumens than do capillaries, although they serve similar functions.  Seen here is a venule cut in longitudinal section.  Also present are capillaries and an arteriole with a single layer of smooth muscle cells.  Surrounding the venule is loose connective tissue with elastic fibers cut in cross section.  1000x

Elastic fibers <p>The smallest venules, composed simply of an endothelial layer, have wider lumens than do capillaries, although they serve similar functions.  Seen here is a venule cut in longitudinal section.  Also present are capillaries and an arteriole with a single layer of smooth muscle cells.  Surrounding the venule is loose connective tissue with elastic fibers cut in cross section.  1000x</p>

Elastic fibers

The smallest venules, composed simply of an endothelial layer, have wider lumens than do capillaries, although they serve similar functions.  Seen here is a venule cut in longitudinal section.  Also present are capillaries and an arteriole with a single layer of smooth muscle cells.  Surrounding the venule is loose connective tissue with elastic fibers cut in cross section.  1000x