• The human digestive system is an extended tube with specialized parts between two openings, the mouth and the anus.
  
  
• Food is ingested and then digested to small molecules that are absorbed. Indigestible materials are eliminated.

1. What is the general structure of the digestive tract? What is the name of the two openings?
   Answer
   
   
2. What happens to indigestible materials?
   Answer

• Human Digestion
• Mouth and Esophagus
• Stomach
• Small Intestine
• Large Intestine

Art Labeling Activity

• Digestive System I (30.0K)
• Digestive System II (43.0K)
• Digestive System III (46.0K)
• Mouth (41.0K)
• Teeth (47.0K)
• Swallowing (49.0K)
• Wall of the Digestive Tract (32.0K)
• Anatomy of Small Intestine (46.0K)

• The pancreas, the liver, and the gallbladder are accessory organs of digestion because their activities assist the digestive process.

1. What are three accessory organs that assist with the digestive process?
   Answer
   
   
2. How does each accessory organ contribute to the digestion of food?
   Answer

• Accessory Organs

ESP activity

• Accessory Organs

Art Labeling Activity

• Hepatic Lobules (47.0K)

• The products of digestion are small molecules, such as amino acids, fatty acids, and glucose, that can cross plasma membranes.
  
  
• The digestive enzymes are specific and have an optimum temperature and pH at which they function.

1. What nutrient molecules are absorbed following the digestion of carbohydrates? of proteins? of lipids?
   Answer
   
   
2. What are the main digestive enzymes, and what factors affect how they function?
   Answer

• Enzymes and Hormones

• The digestive system works with the other systems of the body to maintain homeostasis.

1. How does the digestive system work with other systems of the body to maintain homeostasis?
   Answer

• Systems Review Quiz

• Proper nutrition supplies the body with energy, nutrients, and all vitamins and minerals.

1. Why is proper nutrition important to good health?
   Answer

• Nutrition