The chemical messengers of the human body are known as hormones. The glands that make and release these hormones make up the endocrine system. This educational volume shows readers how this important system impacts almost every part of the human body. Concise and manageable text is paired with attention-grabbing images, helping readers of many ages and levels develop a deeper understanding of the endocrine system. This engaging book is a convenient guide for struggling readers to learn about this key concept from the upper elementary science curriculum.