ANSWER :
Tracing the pathway of a drop of blood from the capillary bed of the right thumb to the capillary bed of the left thumb :-
Capillary bed (in right thumb) > Venules > Cephalic vein > Basilic vein > Axillary vein > Subclavian vein > Brachiocephalic trunk > Superior vena cava > Right atrium > Tricuspid valve > Right ventricle > Pulmonary semilunar valve > Pulmonary artery > Lungs > Pulmonary vein > Left atrium > Mitral valve > Left ventricle > Aortic semilunar valve > Aorta > Aortic arch > Brachiocephalic trunk > Left subclavian artery > Left axillary artery > Left basilic artery > Left cephalic artery > Arterioles > Capillary bed in the left hand.
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