How many cells are in the human body? Questions like this are answered in this engaging look at cells. Readers learn that they are the building blocks of the human body. They'll go on an adventure with Dr. Seymour Skinless, who travels under the skin to investigate how our bodies work. Dr. Seymour Skinless explains how cells function, the structure of cells, and many useful facts on this essential science curriculum topic. Stimulating fact boxes, a thorough glossary, eye-catching illustrations and diagrams, and full-color photographs add to this exciting trip inside the human body.