The heart muscle is a powerful organ which pumps blood through the chamber and its valves in the distribution system, also known as the circulatory system.
Located near the heart of the center of the chest cavity.
The study deals with the science of heart cardiology. Average heart weight is 250-300 grams. The heart has a conical shape. It consists mainly durable elastic fabric - heart muscle to contract rhythmically throughout life and distilled through arteries and capillaries to the tissues of the body the blood. The average heart rate - about 70 times per minute.
The human heart is divided by partitions intofour chambers which are filled at different times of blood. The lower, thick-walled chambers of the heart are called the ventricles. They act as a pump and after receiving blood from the upper chamber by reducing it to send artery. The process of contraction of the ventricles - it is the heart. The upper chambers are called atria, which, thanks to the elastic walls stretch and easily accommodate a coming between contractions blood from veins.
The left and right side of the heart are separated byother, each of them consists of the atria and ventricle. Oxygen-poor blood flowing from the body tissues, first goes to the right department, and after sent to the lungs. The Left Front is supplied, on the contrary, oxygen-rich blood from the lungs, and is forwarded to all tissues of the body. Due to the fact that the left ventricle performs most hard work, which is to discharge blood through the systemic circulation, it is different from other cells of the heart of its massiveness and greater wall thickness - about 1.5 cm.
In each half of the heart ventricles and atriainterconnected opening closed valve. The valves open only towards the ventricles. This process helps tendon threads, attach one end to the valve flaps, as opposed to the papillary muscles, are placed on the walls of the ventricles. These muscles are outgrowths of the ventricular wall, and cut at the same time with them, resulting in tendon thread tension and letting the blood back into the atrium. The tendon strands prevent eversion of the valves in the direction of reducing the atria when the ventricles.
In areas where the aorta exits from the left ventricle,and the pulmonary artery - from the right ventricle, the semilunar valves are placed in the form of pockets. Blood passes through them into the aorta and pulmonary artery, but the movement back into the ventricles is impossible due to the fact that when blood semilunar valves and filling merge straightened.