is a hollow muscle that located in the chest is located (between the two lungs to in). To keep the circulation going to pull the heart regularly. For synchronization of the phases in which the heart chambers fill with blood and that another pump, provides the internal electrical activity of the heart, which is the organ in a logical sequence shows contraction and relaxation.

During the relaxation phase - diastole - the atria fill with blood (right and left oxygen oxygen-rich) and the discharge in the rooms. In the contraction phase - systole - pull the rooms together. The right ventricle pumps blood to the lungs and then the left ventricle pumps it into the aorta from which all organs of blood be provided.

The heart itself is supplied with blood through two coronary arteries. This judge and left coronary artery originates from the root of the aorta.


Man Gay sapiens or a bipedal primate species in the family Hominidae. Research suggests that modern humans about 200,000 years ago in Africa emerged as a species. Humans have highly developed brains, which he is capable of abstract thinking, language, introspection, problem solving and emotion. Thanks to his intelligence and upright posture, allowing the arms to be free to pick up objects and manipulate, the man much more than other species able to use tools.