The product contains three activities to supplement your current human body unit. There is an activity for the respiratory system, the circulatory system, and the digestive system. This product contains thorough, step-by-step instructions for each activity, an "I can" statement sign for each activity, and a student response packet with a writing component for each activity.
In my classroom, we had a Mad Science Party instead of a Halloween party with rotating centers run by parent volunteers, but these activities can be done on separate days, as whole group demonstrations, etc.
My students loved the Mad Science Party and the activities that went with it. I hope this product is as helpful and enjoyable to you and your students as it has been to mine.