What is electrocardiogram

Since the atoms of all substances constructed of electrically charged particles, and chemical reactions take place because of the interaction between the atoms, it is not surprising that those complicated biochemical processes which take place in a living body, accompanied by the appearance of electric currents. In due time we will see that all the work nerves is to transmit impulses with electrochemical nature. Body tissue contain a lot of water with the dissolved salts, and therefore good conduct electricity. Even ordinary water is a good conductor. If we spoiled electric kettle and touch to it when it is on, accompanied by a "blow", the latter will happen in case, when we are without turning off the kettle will fill it up with water from the iron vessel (bucket or circles), a current will flow through the water jet. Salt solutions - especially good conductors. The famous story of the boy who was to empty the bladder from a bridge passing over the high-voltage transmission line. A jet of urine hit the wire - the boy was instantly killed.
Thus, on the one hand, in our tissues generate electric currents, currents, these may well be. When the muscles, particularly heart muscle, there are particularly strong currents. If the person quiet, relaxation and loosening other muscles, it is possible to record those currents that are dependant on the heart and spread to other parts of the body: chest wall, arms, legs, etc., With the help of a special apparatus - electrocardiograph, nowadays became mandatory equipment in each medical institution (from large hospitals to rural clinics, doctors to record the nature of the currents of the heart. Normal electrocardiogram includes five waves, or teeth, denoted by the Latin letters from R to the So-Wave R reflects the work of the Atria, the remaining teeth - operation of the ventricles. Accounting data electrocardiogram very important for various diseases of the heart.
An important property of the heart muscle is the mechanical heart, i.e. its ability to contract rhythmically even outside of an organism under the influence of excitations arising in heart tissues as the result of metabolic processes. This allows for a long time to learn how to act on extracted from the body of the animal heart variety of substances (for example, test new drugs). Basing on this property of the heart, the Russian scientist A. A. Kulyabko produced in August 1902 his famous experience revival of the human heart. Three-month-old baby died with pneumonia. After 20 hours of death Kulyabko removed from the corpse's heart quickened him and forced to decline within a few hours.