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The Digestive System: Introduction Human Bio 11. The Digestive System Food must be broken down into building blocks before it can be absorbed by cells.

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Presentation on theme: "The Digestive System: Introduction Human Bio 11. The Digestive System Food must be broken down into building blocks before it can be absorbed by cells."— Presentation transcript:

1 The Digestive System: Introduction Human Bio 11

2 The Digestive System Food must be broken down into building blocks before it can be absorbed by cells. The digestive system helps break food down.

3 Ingestion The consumption of a substance, through the mouth. ▫ Eating and Drinking.

4 Digestion The process of breaking down food by mechanical action and enzymatic action. Time varies on person and food type. ▫ Could be approx. 20 hours to pass from mouth through to elimination of feces.

5 Digestion Mechanical Action: ▫ Physical forces. ▫ Using your teeth. Enzymatic Action: ▫ Chemical reactions. ▫ Using saliva and stomach acids.

6 Metabolism The process of using broken down food for energy.

7 Metabolism Catabolic Reaction: ▫ Breaks down food so the nutrients can go where they need to. Anabolic Reaction: ▫ Smaller, broken down pieces are used by the cells to take care of the body.

8 Metabolism Metabolic Rate: ▫ How fast your body breaks down your food. A fast metabolism is known to keep weight down. ▫ Can be a problem if someone is trying to gain weight and/or muscle mass.

9 Metabolism Factors that affect Metabolic Rate: ▫ Genetics ▫ Overactive Thyroid Gland ▫ Smoking ▫ Stress


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