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The heart pumps the blood into the lungs. oxygen is received from the lungs. Once the blood inside the lungs is oxygenated, it goes back into the left auricle. Then it is pumped into the aorta which branches into smaller arteries until it passes through the arterioles. Then the blood passes through capillaries. Here, the blood gives up its oxygen and nutrients to the tissues and absorbs carbon dioxide and other waste products. The blood completes its circuit by passing through veins that join to from vessels until it reaches the largest veins. they are the inferior and superior venacava which returns to the right side of the heart. blood is pumped mainly by contractions of the heart and arteries. 
Valves in the heart and in the veins helps to flow the blood in one direction. Superiorvena cava brings deoxygenated blood to right auricle from the brain, head, neck, hands, arms, etc In the same way, the inferior venacava brings the impure blood to the lower part of the body such as stomach, intestine, kidneys and legs.As soon as the right auricle is filled with deoxygenated blood, the tricuspid valve in between the right auricle and right ventricle opens. so, the blood moves into the right ventricle .the tricuspid value closes once the right ventricle is filled with blood.the blood is then pumped towards the pulmonary artery. Pulmonary artery divides off to left and right branches that are joined to the lungs. Through these, blood reaches the alveoli or air sacs of the lungs. the blood capillaries from a fine network in the alveoli. The oxygen that we inhale passes into blood capillaries from the alveoli and carbon dioxide passes into the alveoli from the capillaries. The process of carrying out carbon dioxide and taking in oxygen into the blood is continuous. 

Circulatory system is the combined function of the heart, blood and blood vessels to transport oxygen and nutrients to organs and tissues throughout the body and carry away waste products. Among its vital functions, the circulatory system increases the flow of blood to meet increased energy demands during exercise and regulates body temperature. when foreign bodies or organisms invade the body, the circulatory system swiftly conveys whit blood calls and antibodies to regions under attack. when there is an injury or bleeding on our body, the circulatory system sends clotting calls and proteins to the affected site to clot the blood and heal.