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+