Contents: Human blood (sm, st, 900X) • Phagocyte (em, 25,000X) • Artery and vein(cs, st, 35X) • Capillaries in the lung (cs, i, 360X) • Lymph vessel and valves (wm, st, 60X) • Rat heart (ls, st, 4X) • Rat heart (cs, st, 6X) • Valve at aorta (ls, st, 7 1/2X).
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