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Atria removed (Superior view)

1. Pulmonary valve

2. Aortic valve

3. Mitral valve

4. Tricuspid valve

5. Right ventricle

Cross section through the ventricles (Anterior view)

1. Right ventricle

2. Interventricular septum

3. Left ventricle

4. Mitral valve

5. Tricuspid valve

6. Chordae tendineae

7. Papillary muscle