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ANATOMY OF THE HEART • Heart is located in the chest cavity and surrounded in a fluid filled sac called (pericardium) • Walls of the heart are divided into three definable layers. • Epicardium: Is the outer protective layer of the heart wall, it is composed of connective tissues and covered by epithelium • Myocardium: Is the middle layer of the walls of the heart and it is composed of cardiac muscle fibres; It is these fibres that allow heart to contract. • Endocardium: Is the inner layer of the heart walls and it is made up of epithelial and connective tissues. Heart is divided into 2 halves by a septum in the middle, so we have a right half and a left half and each half is further divided into 2 chambers upper one is called atria and lower is known as ventricle. Myocardium of the atria and ventricle is separated by a...

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