Education.com has many charts and worksheets and activities to enhance our human anatomy study.
Science Worksheets: Awesome Anatomy: Follow Your Heart
Homeschool Helper Online's Free Digestive System Worksheet
Use with children's book... The Quest to Digest. Worksheets: Awesome Anatomy: What's Eating You?
Free Digestive System Worksheets
Digestive System Worksheet and a variety of others (skeleton, human body, etc) - free printables
The Biology Corner - this site has tons of free biology worksheets, labs, diagrams, etc.
Print ready worksheet picture of the organs and accessory structures of the digestive system. The site I actually wanted to pin has TONS of links on it, science and otherwise - go to http://www.internet4classrooms.com/science_elem_general.htm for these.