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Heart - a hollow muscle about the size of the organ szhatoro fist. Inside, the heart is divided vertically muscular wall called the septum (septoy). On each side of the wall - the upper chamber (atrium) and a thicker, lower chamber (ventricle). Blood moves through each side of the heart systematically. Deoxygenated Blood comes into the right atrium. It then enters the right ventricle from where it is pumped to the pulmonary artery to the lungs. Oxygenated blood returning first atrium flows into the pulmonary veins. This blood enters the left ventricle and is then pumped into aortu for treatment.
The blood is made up of plasma, red blood cells (RBC), white blood cells (WBC) and plastinki (platelets).
In its passage through the body's blood (oprana) carried in the arteries and veins. Most of the transport (transport), oxygenated blood arteries, veins and most transports deoxygenated blood. The largest artery - the aorta. The split in the narrow arteries branch (branch), called arteriols. which in turn are divided into capillaries. It is through the very thin capillary walls of blood casts oxygen and nutrients and receives carbon dioxide and waste. Deoxygenated blood in the capillaries flows into venules, and then to a vein. The two largest veins, venae cavae. return the blood to the heart.
The blood flow in each side of the heart is controlled by a number of valves. The pumping action of the heart achieved a reduction of the heart muscle. The rhythm of heartbeat is regulated by the leader, the concentration of specialized cardiac tissue. The leader also helps to ensure the correct sequence of actions during each heart beat. The period of contraction (systole) followed by a period of relaxation (diastole), during which the heart again fills the electrical activity of the heart, called an electrocardiogram (ECG).
Heart disease - the usual term used to describe a variety of cardiac disorders. They include arteriosclerosis, coronary heart disease, hypertension, angina, and many others.
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