The Digestive System Digestion and Digestive Enzymes Nutrition

The Digestive System Digestion and Digestive Enzymes

Nutrition and Digestion in Humans • • Human nutrition Balance diet includes the following: 1. 2. 3. 4. 5. 6. Carbohydrates Fats Proteins Minerals Vitamins Water

Where does digestion begin? • • What structures are used for digestion? Think about the last thing you ate. What did you first do with the food? Your mouth is the first site of digestion.

Digestion - Function • Helps break down food into simpler molecules that can be used by the cells of the body

2 Types of Digestion • Mechanical Digestion • Chemical Digestion

Mechanical Digestion • Physical breakdown of large pieces of food • Chewing (teeth) • Stomach

Chemical Digestion • Digestive enzymes breakdown food into smaller molecules • Saliva • Stomach • Small Intestine

Digestive Enzymes • Speed up the rate of a reaction • Break down food

Mouth • Teeth – Mechanical Digestion • Saliva – Chemical Digestion

Esophagus • Peristalsis contraction of smooth muscles squeeze food through the esophagus

Stomach • Chemical Digestion • Mechanical Digestion

Small Intestine • Chemical Digestion • Absorption of food • Nutrients are absorbed into the bloodstream.

Large Intestine • Removes water from undigested material

In Review… • The Function of the Digestive System – To break down food into simpler molecules that can be absorbed and used by cells in the body • Two types of Digestion – Mechanical – Chemical

In Review • Structures of the Digestive System – Mouth • Mechanical & Chemical Breakdown of food – Esophagus • Moves food down to stomach by PERISTALSIS – Stomach • More Mechanical & Chemical digestion – Small Intestine • Absorbs nutrients – Large Intestine • Removes Water from waste