Put the human heart in your students' hands! When completed, the 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 the 29-piece plastic model, display stand and activity guide with facts and photo-illustrated assembly instructions-great for centers. Measures 5" tall when assembled. Grades 3 and up. Ages 8-11.