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1960s: Animated human heart pumps. Heart valve opens and closes.

1960s: Animated human heart pumps. Heart valve opens and closes.

1960s: Diagram of interior heart structure. Schematic view of heart. Four chambers of heart. Atria chambers of heart. Ventricles in heart. One way heart valves. Heart as double pump.

1960s: Diagram of interior heart structure. Schematic view of heart. Four chambers of heart. Atria chambers of heart. Ventricles in heart. One way heart valves. Heart as double pump.

1960s: Diagram of interior heart structure. Schematic view of heart. Four chambers of heart. Atria chambers of heart. Ventricles in heart. One way heart valves. Heart as double pump.

1960s: Diagram of interior heart structure. Schematic view of heart. Four chambers of heart. Atria chambers of heart. Ventricles in heart. One way heart valves. Heart as double pump.

1960s: heart anatomical structure in specimen. Tricuspid valve scope view. Contraction and relaxation of tricuspid valve. Closure of flaps. Schematic diagram of valve flaps. Pulmonary valve drawing.

1960s: heart anatomical structure in specimen. Tricuspid valve scope view. Contraction and relaxation of tricuspid valve. Closure of flaps. Schematic diagram of valve flaps. Pulmonary valve drawing.

1960s: heart anatomical structure in specimen. Tricuspid valve scope view. Contraction and relaxation of tricuspid valve. Closure of flaps. Schematic diagram of valve flaps. Pulmonary valve drawing.

1960s: heart anatomical structure in specimen. Tricuspid valve scope view. Contraction and relaxation of tricuspid valve. Closure of flaps. Schematic diagram of valve flaps. Pulmonary valve drawing.

1960s: Heart valve opens and closes. Animated human heart pumps.

1960s: Heart valve opens and closes. Animated human heart pumps.

1960s: schematic diagram of heart structures. Left pump of heart. Ventricles in heart. Right pump of heart. Relaxation of atrium. Tricuspid valve. Ventricle fills. Valve flaps.

1960s: schematic diagram of heart structures. Left pump of heart. Ventricles in heart. Right pump of heart. Relaxation of atrium. Tricuspid valve. Ventricle fills. Valve flaps.

1960s: schematic diagram of heart structures. Left pump of heart. Ventricles in heart. Right pump of heart. Relaxation of atrium. Tricuspid valve. Ventricle fills. Valve flaps.

1960s: schematic diagram of heart structures. Left pump of heart. Ventricles in heart. Right pump of heart. Relaxation of atrium. Tricuspid valve. Ventricle fills. Valve flaps.

1960s: schematic view of left heart pump. Pulmonary vein in heart. Fresh supply of oxygen in heart. Mitral valve in heart. Mitral valve closure in specimen.

1960s: schematic view of left heart pump. Pulmonary vein in heart. Fresh supply of oxygen in heart. Mitral valve in heart. Mitral valve closure in specimen.

1960s: schematic view of left heart pump. Pulmonary vein in heart. Fresh supply of oxygen in heart. Mitral valve in heart. Mitral valve closure in specimen.

1960s: schematic view of left heart pump. Pulmonary vein in heart. Fresh supply of oxygen in heart. Mitral valve in heart. Mitral valve closure in specimen.

1960s: scope view through pulmonary valve specimen. Opening and closing of pulmonary valve. Schematic drawing of right side of heart. Complete right pump cycle.

1960s: scope view through pulmonary valve specimen. Opening and closing of pulmonary valve. Schematic drawing of right side of heart. Complete right pump cycle.

1960s: scope view through pulmonary valve specimen. Opening and closing of pulmonary valve. Schematic drawing of right side of heart. Complete right pump cycle.

1960s: scope view through pulmonary valve specimen. Opening and closing of pulmonary valve. Schematic drawing of right side of heart. Complete right pump cycle.

1960s: X-ray. Heart beats.

1960s: X-ray. Heart beats.

1960s: X-ray. Heart beats. Catheter releases contrast dye.

1960s: X-ray. Heart beats. Catheter releases contrast dye.

1970s: Diagram of heart. Animated arrows appear. Text reads "atrium." Man speaks.

1970s: Diagram of heart. Animated arrows appear. Text reads "atrium." Man speaks.