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Peritubular capillaries
Venules are small blood vessels with three basic layers. These layers are an inner membrane called an endothelium, a middle layer of muscle tissue, and the outer layer, which is made of fibrous connective tissue.
The blood in venules of the systemic circulation is deoxygenated. The blood in pulmonary venules is oxygenated.
Microcirulation consists of terminal arterioles connected to capillaries. The capillaries are connected to post-capillary venules which are connected to the veins,
The structure of an arteriole is:Arterioles are tiny branches of arteries that lead to capillaries.These are also under the control of the sympathetic nervous system, and constrict and dialate, to regulate blood flow.
Function- a venuole does the same job as a vein but is smaller than a vein. They are vessels that drain the deoxygenated blood from the capillaries and takes them to the veins which returns it to the heart. Structure- a venuole branches off the vein and is also linked to the capillries.
The venules are tiny blood vessels that return blood to the veins. Only 25 percent of a humans blood are contained in the venules.
venules
in your body
Small postcapillary venules consist entirely of endothelium just like capillaries (the larger venules have smooth muscle and thin externa as well). Also both capillaries and venules have no elastic tissues. Postcapillary venules are extremely porous which makes them more like capillaries then veins, and fluid and WBC's move easily into the bloodstream through these walls.
Venules
Venules