The heart
How is it structured?
The heart is about 3 billion (3 x 10 9) beats throughout the life of a man of the hardest working muscle in the body. This figure represents approximately the average number of revolutions of a car engine in his life.
The heart consists of muscles that forms the heart chambers and pumps the blood through the body. On the main artery (Aorta), the fresh, pumped into the lungs oxygen-rich blood made under pressure (the pressure) of the left ventricle in his body.
added after the blood in the capillaries of the skin, muscles and organs, such as made the heart, the oxygen (O2) and nutrients like fat and sugar and the "waste" occurring, unusable carbon dioxide (CO2) was added into the red blood cells transporting spent this vein, low oxygen and carbonic acid-rich blood low pressure through the vast network of veins of the vein to the left ventricle, which through the capillaries of the lungs pumped back to the left ventricle.
In the lungs is released through the alveoli, the carbon dioxide (CO2) to the air and passed instead of the oxygen from the air we breathe to the red blood cells for further transport into the body.
The ernegiereichen nutrients such as fat, sugar or protein substances are absorbed by the intestine and after processing in the liver of this immediately made before entering the right heart in the venous blood for onward through the lungs into the body.
The normal heart
The four heart valves (mitral-aortic-tricuspid and pulmonary valve) ensure that the blood always flows in the right direction through the body.
The main sections of the myocardium
(Blue right side of the heart, the left side of the myocardium rot)
Source: University of New Haven (USA Modified)
The outside of the heart are the three major coronary arteries. They are between 4 and 0.5 mm thick arteries, also called coronary arteries (the figure shows bottom). Of these veins starting pulling smaller vessels into the myocardium, where they form the capillaries in the form of a dense "Felted vessels" to supply to each individual heart muscle cell (capillary).
The coronary vessels (coronary arteries)