Chapter 13 The Cardiovascular System
The heart is divided into right and left portions by the . interatrial septum. and the . interventricular septum. Heart valves open and close to maintain the one-way flow of blood through the heart. The heart has three layers: the . endocardium, which lines the interior cavities of the heart; the . myocardium, which is the thick, muscular layer ... ................
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