Trend Enterprises 38913 The Human Body Charts, 17"x22", Multicolor Sold as 6/PK. Human Body Learning Charts illustrate the respiratory, cardiovascular, nervous, skeletal, muscular, digestive, reproductive, endocrine, and excretory systems. The back of each chart features teacher-created reproducible activities, subject information, and helpful hints. Ideal for fifth-grade to eighth-grade (ages 10 to 14).