This four-part DVD series presents a detailed review of the important concepts in middle body systems and health. Titles are: "Healthy Circulatory and Respiratory Systems," "Healthy Digestive and Excretory System," " Healthy Nervous and Endocrine System," and "Healthy Skeletal and Muscular System." Each program is 20 minutes and has a 30-page teacher guide plus video indexes, labeled slides, glossary, English subtitles. The PDF guides for each program can be accessed by putting the DVD into your computer and opening them via Adobe Acrobat Reader on both Macs and PCs.