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The heart is the muscle in the human body that 's working . Located almost in the center of the chest , the heart of a child is about the same size as your fist. During an average lifetime, the heart will beat three billion times , ie pumping an amount of blood equivalent to almost one million barrels . The heart operates continuously , 24 hours a day, 7 days a week , even when we sleep.
Theheart of a child works as hard as an adult . In fact, a baby's heart may beat up to 190 times per minute, while the adult usually beats 60 to 100 times per minute. The frequency at which the heart pumps gradually decreases from birth to adolescence.
The cardiovascular system includes the heart and blood vessels and is responsible for circulating blood throughout the body . A healthy cardiovascularsystem is vital to deliver oxygen and nutrients to the body .

The heart is located in the center of the chest , somewhat to the left, between both lungs. Has an oblique slope to the left and back to front .


right atrium
Right atrial lead the superior vena cava, inferior vena cava , and coronary sinus . Besides this is perforated by vessels called Thebesian .
left atrium
Receivesoxygenated blood from the lungs and pushes it through the mitral valve into the left ventricle, which distributes throughout the body via the aorta .
heart valve
Its function is to keep isolated for a moment the blood flow in any of the four chambers . With different heart contractions also contract in a sequence of four chambers , pumping the blood in one direction. No valves , blood would cavityafter shrinkage
Vena cava superior
It is a venous trunk or large vein that collects blood from the head , neck, upper limbs and blood tórax.Retorna all remaining structures above the diaphragm muscle except for the lungs and heart.
right ventricle
The right ventricle receives deoxygenated blood from the right atrium through the tricuspid valve and drives it away from the heart via the pulmonaryartery.
left ventricle
It is the portion of the heart muscle tissue as much because the left ventricle is the one who pushes blood to the aorta , which carries blood to most of the body.
aorta
It is the main artery of the human body function is to transport the aorta and distribute oxygen-rich blood to all those arteries
pulmonary Artery
It is the artery that the blood flows from the rightventricle to the lungs to be oxygenated through the alveolar capillary barrier in a process known as hematosis . To do this, through the pulmonary valve to the outlet right ventricle.
pulmonary vein
Are the set of veins responsible for delivering oxygenated blood from the lungs to the heart. This is the only organism veins carry oxygenated blood .
Inferior vena cava
returns blood from the lowerlimbs, the organs of the abdomen and pelvis to the right atrium of the satellite is heart.2 vein abdominal aorta and venous return meets all infradiaphragmatic veins.
heart valve
Are fabrics that are in the outlet ducts of the four chambers of the heart which serve the purpose of passing the blood in the right direction , preventing it from flowing backward. Its function is to keep isolated for amoment the blood flow in any of the four chambers .



Cardiac cycle
human
Each heartbeat involves a sequence of events that together form the cardiac cycle , consisting mainly of three stages: atrial systole , ventricular systole and diastole . The cardiac cycle causes the heart alternates between contraction and relaxation about 72 times per minute, ie the cardiac cycle lasts about 0.8seconds.
atrial systole
heart
During atrial systole , the atria contract and project the blood into the ventricles , although this step is essentially passive blood , so little involved atrial contraction at rest , it does become important during exercise . Once the blood has been expelled from the atria , the atrioventricular valves between the atria and ventricles are closed. This prevents...