Students explore the location, structure, and function of organs in the human digestive system.
After completing this tutorial, you will be able to complete the following:
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. Both the bile and the digestive juices are stored in the gall bladder before being added to the small intestine. 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.
|Approximate Time||25 Minutes|
|Pre-requisite Concepts||organ systems|
|Type of Tutorial||Concept Development|
|Key Vocabulary||absorption, accessory organs, acid|