ALL of the heart as the organ - Read useful advice
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In the adult human heart weighs about 250-350 grams, and it is comparable in size with a fist. The Authority is located in front of the spine of the chest wall in its central part with a slight shift to the left. The heart is placed in a special bag that has two walls and is called the pericardium. The walls of the heart consists of three layers: epicardium, myocardium and endocardium. Exterior (epicardium) functions as a protective layer. Middle layer (myocardium) is composed of cardiac muscle. The inner layer (endocardium) comes into direct contact with blood during operation of the organ. Also, the heart has four chambers (cavities) - two atria and the two lower ventricle. With each heartbeat into work first enter the atrium, which directs blood into the ventricles corresponding to pressure push blood out of the heart of the corresponding arteries (pulmonary artery and ascending aorta).
Principle of operation
The right side of the heart is responsible for pumping the venous blood. After it enters the pulmonary artery into the lungs, which is saturated with the necessary oxygen. Then, through the left side of the heart blood passes through the left atrium, and then through the butterfly valve entering the left ventricle. Thereafter, a high pressure is started in the aorta, from where delivered to all parts of the human body via the blood vessels.
The reduction in heart muscle due to which body and operates directly controlled by the nervous system - nervous impulses initiated the sequence of cuts in the body. The day the heart contracts about 100 thousand. Times. Adult heart may beat from 60 to 80 times per minute, and the heart can produce neonates of 70 to 190 beats.
Heart disease occur when heart damage or disruption of one of the components of the heart. Among the diseases of the heart distinguish ischemia (a disease of the heart arteries), cardiomyopathy (muscular heart disease), hypertension, heart failure, pulmonary heart (expanding the right section of the heart), arrhythmia, endocarditis, myocarditis, cardiomegaly, valvular, cerebrovascular disease, peripheral artery disease , congenital heart disease and rheumatic heart disease. These conditions can be caused as a result of infectious lesions, growth of malignant tumors, birth defects, the impact of diseases of other organs and the impact of external factors (alcohol, tobacco, or work in hazardous occupations).
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