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encloses the heart and the proximal ends of the large blood vessels to which it attaches.
the thick middle layer which consists mostly of cardiac muscle tissue that pumps blood out of the heart chambers.
the inner layer which consists of epithelium and connective tissue that contains many elastic and collagenous fibers.
the lower chambers which recieve blood from the atriaand contract to force blood out of the heart into the arteries.
a large valve with three cusps which lies between the right atrium and the right ventricle.
veins of the heart whose paths roughly arallel to those of the coronary arteries which drain blood that has passed through myocardial capillaries
clumps and strands of specialized cardiac muscle tissue whose fibers contain only a few fibrils.
a key portion of the cardiac conduction which is a small elongated mass of specialized cardiac muscle tissue just beneath the epeicardium
consists of vessels that carry blood from the heart to the lungs and back to the heart
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