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From the lungs, oxygenated blood is returned to the heart through the pulmonary veins.

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From the pulmonary trunk it moves into the right and left pulmonary arteries to the lungs.

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From the right ventricle, it goes through the pulmonary semilunar valves to the pulmonary trunk

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From right atrium, it goes through the tricuspid valve to the right ventricle.

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The RBC then enters the right atrium from the superior and inferior venae cavae, and the coronary sinus.

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Deoxygenated blood continues to flow from the brachial vein to the axillary vein in the armpit and the subclavian vein, before forming the brachiocephalic vein with blood returning from the head.

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The palmar venous arches carry blood to the radial and ulnar veins.

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The palmar digital veins and palmar metacarpal veins deliver deoxygenated blood from the tissues of the fingers and palm to the superficial and deep palmar venous arches.

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Many smaller arteries, such as the palmar digital arteries and palmar metacarpal arteries, branch from the palmar arches to supply blood to the palm and fingers.

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In the hand, the ulnar and radial arteries reconnect to form the superficial and deep palmar arches.

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The brachial artery divides into the radial and ulnar arteries.

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The subclavian arteries continue through the armpits as the axillary arteries and then onward into the upper arms as the brachial arteries.

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Oxygenated blood exits the heart through the aorta and reaches the arms through the brachiocephalic trunk and the left and right subclavian arteries that run beneath the collar bones.

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When the ventricles contract during a heartbeat, the blood on the left side is forced into the aorta.

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As the chamber fills, it presses open the mitral valve and the blood flows down into the left ventricle.

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The oxygen-rich RBC coming from the lungs enters the upper left chamber of the heart, the left atrium.