The heart is the size of a fist. The outer most layer is the fibrous layer, then there is a parental layer. The parental layer processes water, lubricating fluid, and percordial fluid. The inner most visceral layer is thin and delicate. There are three layers of the heart are endocardium, myocardium, and epicardium. The endocardium consists of simple squamous epi. The myocardium is the cardiac muscle. Finally the epicardium is areolar connective tissue.
The SA node is the pacer maker cells it is located on the back of the heart. The AV node is on the front of the heart. Sodium Ions cause electrical chargers that open up the calcium ions that cause the heart muscles to contract. The purkinje fibers is where the electricity goes.
The P wave represents depolarization in the right and left atrium muscle cells. QRS represents depolarization of the ventricles. The T wave is the re polarization of the ventricles.
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