The heart tissue is composed of cardiac muscle called _______________.

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The heart is a muscular pump, which is composed of specialized cardiac muscle called myocardium (Myo = muscle, Cardium = heart).  The myocardium is thicker on the left side of the heart because more forceful contractions are necessary to supply blood to the entire body as opposed to just the lungs from the right side.
The pericardium is not muscle tissue, but a connective tissue that surrounds the outside of the heart (peri = around). This layer provides protection and stability for the heart. The pericardium is composed of two layers: an outer fibrous layer and an inner, or visceral layer called the serous pericardium. The space between the two layers is called the pericardial cavity.
The endocardium is the innermost layer of the heart wall (endo = inside) and acts as the lining of the chambers. This layer is composed of endothelial cells.
The epicardium is sometimes used synonymously with the term pericardium, as it describes an outer protective layer of the heart. However, it more specifically refers to the inner layer of the pericardium.
You may use the diagram below as a visual reference for the layers of heart tissue.
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The Heart Tissue Is Composed of Cardiac Muscle Called _______________