The main function of the heart is to pump oxygen-rich blood throughout the body.The
heart is divided by a septum fruit (septum) into two parts, namely the
left (one atrium and one ventricle) and right (one atrium and one
ventricle). Each ventricle and atrium connected by atrio-ventricular lubung that there is a hole on each valve. This valve serves to keep the blood flowing only one stream only (the atria to the ventricles). Oxygen-rich
blood from the lungs through the pulmonary vein entered the left atrium
into the left ventricle of the heart and into the aorta occurs where
the systematic circulation of oxygen-rich blood will be delivered out of
the heart through the vena cava into the right atrium, right ventricle,
and then finally brought out the heart of the whole body through the pulmonary artery
The heart contracts to pump blood. If the relaxation of the heart chambers heart will be filled with blood. Contraction phase is called systole, while the relaxation phase is called diastole. When ventricular relaxation of blood flow to the heart closes semilunar valves. Ventricle thicker than the atria because the ventricle pumps blood throughout the body. While the atrium only pumps blood to the lungs and the area around it. Movement
of the heart affected by vagus nerve system (the cause of heart motion
is slowed or inhibited) and sympathetic (affects the heart rhythm).
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