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Human body has many seperated organs, and they all needs oxygen and many other component. But they can't produce or get what they need by themselves, thats why they need to get those from other organs, and to transport those ingredient tgey need a transortation system. That transportation system in our body called circulation system.

The circulation need media to transport ingredient needed by body, and body have blood to do the job. The bloods run circulating the body need a circuit, called a blood vessel. The bloods need to move, and for that bloods need a pump called heart.

Blood Vessel
Blood vessel divided into 2 groups based on their flow dirrection:

The vessel become smaller and smaller the farther they get from hearts. The samllest vessel called capillers whose wall so thin that oxygen and other material can penetrate trought them, as for that reason capiller become the place to excange oxygen and carbon-dioxyde and other material and waste to and from other organs.

Heart play an important role in circulation, as it act as a pump for the blood. Heart actually 2 different pump that pump the blood from and to different way. Heart divided into 2 chamber, left and right, and each divided into atrium (for recive the blood) and ventricel (for sending the blood). The right side of heart pump the blood from the whole body to lung, and the right heart pump the oxygenated bloods from lung to the whole body. The right side and left side of heart divideded by septum. Atrium and ventricel connected by a gate called valve. The right atrium and right ventricel connected by tricuspidalis valve. The left atrium and left ventricel connected by mitreal valve. The heart have two natural pacemaker that make the heart beats called Sinus Node (SA node) and Atrium-ventricular node (AV node). The SA node move faster than the AV noce, make it the main pacemaker, the AV node effect showed (and become usefull) if the SA node beats slower then the AV node (due to dissorder or other reasson).

The un-oxygenated blood come to heart from two veins called Vena Cava Superior (From upper part of the body) and Vena Cava Inferior (From bottom part of the body). The blood then flow to the right atrium of the heart. The right atrium then flow to right ventricel trough tricuspidalis valve. The blood then go to the attery called pulmonary attery trought pulmonary valve. The blood then go to the lung and re-oxygenated and go back to heart trought pulmonary vein. This is called pulmonary circulation or small circulation. In the heart blood come to left atrium then go to left ventricel trought mitral valve and then pumped to the body from aorta trought aortic valve. This process called systemic circulation or big circulation. The aorta send the blood to atery and distributed to other body trought atery wich get smaller and smaller and then finally excange the material it's bring on capiller then go to the veins. The vein then finally go back to heart again and the circulation repeated.