Trace the blood to the left thumb and back to the left ventricle where you start

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Explanation / Answer

capillary bed of left thumb --> random digital veins on left thumb/hand --> left radial vein and/or left cephalic vein and/or left median antebrachial vein and/or left basilic vein and/or left brachial vein (venous network is highly variable and also is highly interconnected) --> left axillary vein --> left subclavian vein --> left brachiocephalic vein --> superior vena cava --> right atrium of heart --> right ventricle of heart --> pulmonary artery --> pulmonary artery divides into smaller branches until you reach pulmonary capillary bed --> veins combine into larger and larger vessels until they become the pulmonary veins --> left atrium of heart --> left ventricle of heart --> ascending aorta --> brachiocephalic trunk --> right subclavian artery --> right axillary artery --> right brachial artery --> right radial artery --> right princeps pollicis artery --> dorsal digital artery of the right thumb --> capillary bed of right thumb alternatively, from the right radial artery --> superficial palmar branch of the right radial artery --> right superficial palmar arch --> proper palmar digital arteries of the right thumb --> capillary bed of right thumb alternatively, from the right brachial artery --> right ulnar artery --> right superficial palmar arch --> and so on

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