This lesson contains 3D models. Some of them are available after a free registration to the Lifeliqe app.NGSS and CCSS aligned. Integrated in crosscutting concepts. Aligned with principal science textbooks.The lesson describes human digestive system and explains its functioning.Methodology:• Discussion• Reading• Lecture• Experiment• AssessmentThe principal learning objectives are:• Identify the organs and functions of the digestive system.• Outline the roles of the mouth, esophagus, and stomach