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CIRCULATORY SYSTEM
(The red lines show arteries; the blue, veins.)

1—General circulation in the human body. 2—The heart, showing interior. 3—Cross Section of the heart, seen from above. 4—Circulation of blood in the lungs. 5—Gall Bladder. 6—Liver. 7—Stomach. 8—Circulation of blood in digestive tract.