First Unit- Digestive System


Anatomy of the Digestive System

Yes this is the Large Intestine J0385812.jpg

Unit One Digestive System

Target Objective

Learners will understand the anatomy and physiology of the digestive system.

Unit Objectives

  • Learners will be able to identify all the primary and accessory organs of the digestive system.
  • Learners will know the fuction of each organ in the digestive system.


The process of taking in food and breaking it down for cellular use is a process of mechanical and chemical digestion. The digestive system is comprised of many organs that aid in the digestion of food particles. It is broken down into the primary organs and accessory organs, they are as follows:

  • Primary Organs – Mouth, tongue, teeth, esophagus, stomach, small intestines, and large intestines
  • Accessory Organs – Salivary gland, Liver, gallbladder, and pancreas.

The digestive system is a hollow muscular passageway where food enters the body, is broken down into small particles that can be absorbed into the blood stream and transported to all of the cells of the body. Absorption of nutrients occurs through the process of diffusion. The body cells need energy in order to carry out its daily functions and the food taken in can do that. Any food that is not used is then excreted from the body.

  • Important Terms with Definitions:
    • Mechanical Digestions- the process of breaking down food by teeth or muscular movements.
    • Chemical Digestion – the process of breaking down food by the used of digestive enzymes.
    • Peristalsis – the wave like muscular contraction of the digestive system that help to move contents through it.
    • Mastication –chewing of food particles
    • Defecation – the process of eliminating waste from the digestive system.

Interactive Learning Exercise

In the following interactive activity you will learn everything you need to know about the digestive system. It will introduce you to the organs of the system and some facts about each. It will also introduce you to the digestive enzymes. Please participate in the two activities, “view the digestive system” and “explore the digestive system” go thought all the steps and answer and questions posted in the exercise.

  • Click here to go to links [1]
  • For Fun[2]

Question Guide

Once you have completed the mini-lecture and the interactive exercise complete this question guide to make sure you have learned everything you needed.

File:Question Guide For Unit One.pdf


You are ready for unit 2 Second Unit - Digestive System