Put the human heart in your students' hands. When completed, 3-D model opens so students can explore the heart's inner workings.- Features superior and inferior venae cavae, right and left atria, tricuspid valve, right and left ventricles, pulmonary artery, mitral valve, aortic valve and aorta- Includes 29-piece plastic model, display stand, and guide with facts and photo-illustrated assembly instructions--great for centers- Measures 5" H when assembled- Grades 3+