Ardito Digestive System Review

THE DIGESTIVE SYSTEM A Study Guide Mr. Ardito’s Living Environment

The purpose of the Digestive System To make big things into small things

The Parts of the Digestive System

The Mouth Teeth grind food into swallowable substance (bolus) Enzymes in saliva start to break down starches.

Esophagus Muscular contractions move the bolus to the stomach These contractions are called peristalsis No new digestion occurs

Stomach Stomach is very muscular and churns the food into a paste (chyme). Stomach makes acid which helps break down proteins.

Small Intestine No new mechanical digestion takes place. Enzymes break down proteins, starches, and fats Nutrients are absorbed into the bloodstream via the villi.

Large Intestine Undigested food (now called feces)passes into the large intestine. Water, minerals, and vitamins are reabsorbed.

Anus/Rectum The rectum stores feces until it is ready to be released. The anus is the opening through which feces is released.

Types of Digestion Part Mechanical Chemical Enzymes from Mouth Chewing saliva None (still Esophagus None continuing from mouth) Acid from gastric Stomach Churning of Food juice Small Intestine None Enzymes Reabsorption of Large Intestine None water and minerals

Enzymes Enzymes are chemicals that speed up chemical reactions. Enzymes used in digestion help break big things into small things. 3 types of enzymes Proteases - act on proteins Amylases - act on starch Lipases - act on fats

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Ardito Digestive System Review

by gmanb5 on Oct 16, 2007

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Ardito Digestive System Review — Presentation Transcript