Heart Study is engaged in the science of cardiology.The average weight of the heart 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 the arteries and capillaries to the tissues of the body's blood.Average heart rate - about 70 times per minute.
Shareable human heart walls into four chambers, which at various times filled with blood.The lower thick-walled chamber of the heart called ventricles.They act as a pump and after receiving blood from the upper chamber by reducing send it to the artery.The process of ventricular contraction - this is the heart.The upper chambers are called atria, which, thanks to the elastic walls stretch and easily accommodat
e a coming between contractions blood from the veins.
left and right heart chambers are separated from each other, 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, in contrast, oxygen-rich blood from the lungs, and forwarded to all tissues of the body.Due to the fact that the left ventricle performs the most hard work, which is to discharge blood through the systemic circulation, it is different from the other chambers of the heart of its massiveness and greater wall thickness - about 1.5 cm.
in each half of the heart atria and ventriclesinterconnected by an opening closed by a valve.The valves open solely towards the ventricles.This process helps tendon thread, 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 them at the same time, resulting in tendon thread tension and blood flowing back into the atrium.The tendon strands prevent eversion of the valve in the direction of the atria during ventricular contraction.
In places where the aorta leaves the left ventricle and the pulmonary artery - from the right ventricle, the valves are placed in the form of a crescent-shaped pockets.Through them, the blood passes into the aorta and pulmonary artery, but the movement back into the ventricles can not be due to the fact that the semilunar valves when filling with blood, smooth and merge.