Digestive System Steps

Digestive System Steps

  • Submitted By: cjs120266
  • Date Submitted: 12/13/2013 9:41 PM
  • Category: Science
  • Words: 453
  • Page: 2
  • Views: 85

I. Introduction |
   Thesis: Ingestion, digestion, and absorption are the three major steps involved in the digestive process. |
II. Food is ingested. |
     A. Food enters the mouth. |
    B. Food is chewed. |
    C. Food is ready to travel to the stomach. |
III. Food is digested. |
     A. Food is mixed with acidic gastric juices in the stomach. |
    B. The partially liquid food moves from the stomach to the small intestine. |
    C. Enzymes are secreted. |
IV. Absorption |
     A. The digested food passes through the walls of the small intestine. |
     B. The digested food is absorbed into the bloodstream. |
V. Conclusion |
     Paraphrased Thesis: The digestion process involves three major steps: ingestion, digestion, and absorption. |

Zach this is the main body

    The digestive process is important in maintaining the lives of living organisms and in providing them with needed energy. Groups of organs, mouth, esophagus, stomach, and intestines, work together to perform this complex task. Digestion is the process of breaking down food from large molecules into small ones to make it easier for absorption. The three major steps involved in the digestive process are ingestion, digestion, and absorption.
   Ingestion, which occurs in the mouth, is the first step of the digestive process. After food enters the mouth, the teeth chew it. Saliva, which is produced by the salivary glands, plays a major role in breaking down the food into smaller pieces. These small pieces travel to the stomach through the esophagus.
   In the stomach, the second step of the digestive process begins. When the chewed food reaches the bottom of the esophagus, a valve lets the food enter the stomach. Contraction of the stomach wall mixes the food. Acidic gastric juices, which are secreted by the gastric glands in the stomach, help in mixing the food and in turning it into a partial liquid so...

Similar Essays