http://training.seer.cancer.gov/module_anatomy/images/illu_artery.jpg De bijgaande tekening is van een arterie (slagader). Een vene (ader) heeft dezelfde structuur bestaande uit 3 lagen echter met name de middelste tunica media bevat bij een vene veel minder elastische en spier vezels. De reden hiervan is dat de bloeddruk in de venen veel lager is.

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