At the beginning of a unit on the digestive system, it's important for students to have a foundation of which organs are involved and their function. In this activity, students will label a model of the digestive system. They should include a description of what happens at each stage in the process along with the label. To scaffold this activity, consider providing a list of organs and having students place arrows pointing toward the correct organ.
|Mouth||Food enters the alimentary canal through the mouth. It is chewed by teeth which break food down into smaller pieces. The food is mixed with saliva that contains enzymes.|
|Esophagus||The fibromuscular tube connecting the mouth to the stomach is called the esophagus. Food is pushed down using a wave-like muscular motion called peristalsis.|
|Stomach||The stomach is the muscular organ where food is mixed with gastric juices. Gastric juice has a low pH, meaning it is acidic, and is used to help digest food and kill potentially harmful bacteria.|
|Liver||In the digestive system, the liver produces bile which helps with the digestion of fats and oils.|
|Gallbladder||The gallbladder is where bile is stored and concentrated.|
|Pancreas||The pancreas is where biological catalysts called enzymes are produced. Digestive enzymes speed up the breaking down of large nutrient molecules.|
|Small Intestines||The small intestines are made up of three parts: the duodenum, the jejunum, and the ileum. Here, food is mixed with digestive enzymes and bile. The enzymes speed up the digestion process. Nutrients are then absorbed into the bloodstream.|
|Large Intestines||The large intestines are made up of two parts: the colon and the rectum. In the colon, water is reabsorbed from the food. Feces are stored in the rectum until they are ready to be passed.|
|Anus||Feces leave the alimentary canal through the anus.|
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Create a labeled model of the digestive system. Identify the main parts and describe their function.
Grade Level 6-12
Difficulty Level 3 (Developing to Mastery)
Type of Assignment Individual
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All the labels are correct.
Most of the labels are correct.
Some of the labels are correct.
All the functions are correct with no grammar or spelling mistakes.
Most of the functions are correct with some grammar and spelling mistakes.
Some of the functions are correct with many grammar and spelling mistakes.
Evidence of Effort
Work is well written and carefully thought out.
Work shows some evidence of effort.
Work shows little evidence of any effort.