In this activity about the heart (on page 22 of the PDF), learners examine sheep or chicken hearts to learn about the heart's structure and the flow of blood through the heart. Learners will note various components of the heart (atria, auricles, aorta, etc.) as well as discover how blood circulates through the heart to the body. This activity can be conducted as a demonstration. This lesson guide includes background information, setup and management tips, and handouts.