The Digestive System at a Glance

This opening lesson gives learners a practical map of the digestive system before later lessons examine each organ and process in more detail. It explains digestion as a coordinated sequence: food is taken in, mechanically and chemically broken down, moved through the gastrointestinal tract, absorbed into the body, and finally eliminated as waste.

Learners will identify the major organs, distinguish the digestive tract from accessory organs, and understand the big roles of enzymes, motility, absorption, microbes, and regulation. The goal is not to memorize every structure yet, but to build a clear framework for how the whole system works together.