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ZingPath: Food and Digestion

Digestive System

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Food and Digestion

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Lesson Focus

Digestive System

Life Science

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Learners will explore the location, structure, and function of organs in the human digestive system.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Explain the purpose of the digestive system.
  • Identify the location and function of each part of the digestive system: mouth, esophagus, stomach, liver, pancreas, small intestine, large intestine.
  • Describe the role of enzymes in digestion.

Everything You'll Have Covered

Living organisms require a source of energy and nutrients. Energy is needed for cells to do work. Nutrients provide energy and the material needed to build cell components. In humans and other animals, nutrients are obtained through the digestive tract.

As food enters the mouth, the tongue positions food between the teeth for grinding. Saliva is added to help moisten food for easy swallowing. Saliva also contains enzymes that begin the breakdown of carbohydrates. After chewing, food is swallowed and travels down the esophagus to the stomach.In the stomach, the physical breakdown of food continues as food is churned. Enzymes in the acidic secretions of the stomach help to digest proteins. The liquid mixture in the stomach passes to the small intestine, where the liver adds bile and the pancreas adds digestive juice, which contains many enzymes. These chemicals help to breakdown carbohydrates, fats, and proteins, which are then absorbed through the villi of the small intestine into the bloodstream.

The last part of the digestive system is the large intestine. This is where most water is removed. As water is removed, liquid waste becomes solid waste and is eventually eliminated through the anus.

Tutorial Details

Approximate Time 25 Minutes
Pre-requisite Concepts organ systems
Course Life Science
Type of Tutorial Concept Development
Key Vocabulary absorption, accessory organs, acid, acidic, anus, bile, carbohydrates, chemical digestion, colon, digestion, digestive, energy, enzymes, esophagus, fat, gall bladder, intestines, large intestine, liver, mechanical digestion, mouth, nutrients, organs, pancreas, pharynx, proteins, rectum, saliva, salivary glands, secretions, small intestine, stomach, system, teeth, tongue, tract, villi, villus