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Arteries deliver the blood away from the heart. It'll carry our oxygenated blood and goes to capillaries to distribute the oxygen to every cell of the body.

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The left ventricle will now contract to allow the blood to flow to the aorta then leaves the heart. After this, the oxygenated blood will be distributed throughout the body.

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Deoxygenated blood will then enters the lungs and goes to capillaries. Once it enters it'll go to alveoli and gas exchange will occur. It'll convert the carbon dioxide into oxygen by exhaling. The blood will now be oxygenated

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When mitral valve open it'll let out the oxygenated blood into the left ventricle, then the left ventricle contracts and then the left atrium relaxes. To prevent the blood from going back/backflow the mitral valve will close preventing the blood to go back.

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After the blood has been oxygenated and went through the pulmonary vein it will go now to the left atrium.

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As it enters the right ventricle it'll result on the tricuspids valve to close itself. Another valve called pulmonary valve will then open allowing the deoxygenated blood to enter the pulmonary arteries that is connected to the each of the lung lobes.

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The right atrium then receives the deoxygenated blood then delivering to the right ventricle by having tricuspids valve to open allowing the blood to enter.

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Veins transport deoxygenated blood to the heart. It enters in two pathways through the heart.
- Superior Vena cava
- Inferior Vena Cava