System that circulate blood is called circulatory system.
Heart is the main and major organ of circulatory system. The specialized cell in heart is called cardiac cell.
Heart and blood vassels consists circulatory system.
Blood vassels are three types
Arteries： Arteries carries blood heart to body.
Viens： Viens carries caries blood body to heart.
Capilaries： Capilaries are tiny vassels that involves gaseous exchange.
Heart consist with 4 chambers.
Two upper chamber are called atria and two lower chamber is called ventricle.
Circulatory system are in two parts. one part is systemic circulatory system that control blood circulation between heart and body cell.
Pulmonary circulatory system controls blood circulation between lung and heart.
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