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Heart
...  the sac. There are also three special layers creating the outer wall of the heart. It is epicardium also called the visceral pericardium. It creates the outermost layer of the heart wall. The myocardium, thick layer of muscle squeezed as the heart beats, is the middle layer of the heart wall. The endocardium of the heart wall is the third inner layer. By the way, heart valves are covered  ...

Conduction System of the Heart
...  branches and extend further to the right and left sides of the apex and the interventricular septum of the heart. The heart’s cardiac cycle refers to the contraction and relaxation of the myocardium in the walls of the heart chambers. This process is done by the heart’s conduction system during the time it takes to make one heartbeat. The two atria of the heart contracts at the  ...

Routes Of Circulation
...  supply is known as coronary circulation. The walls situated in the heart has systemic blood vessels- these exist to meet the needs of the heart for blood supply. Oxygenated blood is brought to the myocardium via the left and right coronary arteries. They are also responsible for bringing the myocardium the needed blood supply by branching off. Atrioventricular sulcus, otherwise known as the  ...


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