PEIR Digital Library

Welcome to the Pathology Education Informational Resource (PEIR) Digital Library, a multidisciplinary public access image database for use in medical education.

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DIAGRAM: GASTROINTESTINAL: GI: ARTERY: Effects of Hypertension on the Vessel Wall - 1 of 14; The media is the layer of the artery wall that is comprised of lamellar units of smooth muscle cells that contract to move blood through the vessel. The media makes up most of the thickness of the vessel. As blood pressure naturally rises