301-797-2500. 1718 Underpass Way, Hagerstown, MD 21740 â¢ 301-797-2500 â¢ Hotel Fax: 301-797-6209. The Ramada Plaza-Hagerstown, MD is Located just off I-81 at Exit 5-A, .5 miles North of I-70 on the Western Side of Hagerstown.This Hagerstown Hotel is convenient to Historic Downtown Hagerstown, Hagerstown Premium Outlets, the Valley Mall, and the Hagerstown Regional Airport.Nearby Attractions include Antietam National Battlefield, Harpers Ferry, Fort Frederick State Historical Site, and the Crystal Grottoes Cavern.his Hagerstown Hotel is convenient to Historic Downtown Hagerstown, Hagerstown Premium Outlets, the Valley Mall, and the Hagerstown Regional Airport. Nearby Attractions include Antietam National Battlefield, Harpers Ferry, Fort Frederick State Historical Site, and the Crystal Grottoes Cavern.
Chambers and Valves. The heart is divided into four chambers: (see Figure 2). 1  right atrium (RA). 2  right ventricle (RV). 3  left atrium (LA). 4  left ventricle (LV).
The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium. The heart is a muscular organ that pumps blood throughout the body, with a rhythm determined by a group of pacemaking cells in the sinoatrial node. These generate a current that causes contraction of the heart, traveling through the atrioventricular node and along the conduction system of the heart.