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The Digestive System Food, Food, Food is the Word.

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Presentation on theme: "The Digestive System Food, Food, Food is the Word."— Presentation transcript:

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2 The Digestive System Food, Food, Food is the Word

3 Function Function 1.To break down food into smaller molecules (nutrients) that the body can use –Carbohydrates Simple Sugars –Proteins Amino Acids –Fats Glycerol and Fatty Acids 2.To get rid of solid wastes that remain after nutrients have been extracted

4 Types of Digestion Types of Digestion Mechanical:Mechanical: –PHYSICAL breakdown of food EX. ChewingEX. Chewing Chemical:Chemical: –CHEMICAL breakdown of food by enzymes or other digestive juices EX: Amylase found in saliva breaks down CarbsEX: Amylase found in saliva breaks down Carbs

5 The Path of Digestion The Path of Digestion MouthEsophagusStomach Small Intestine Large Intestine PancreasLiver Gall Bladder Accessory Organs

6 Path of Digestion: Mouth Path of Digestion: Mouth Begins the breakdown of foodBegins the breakdown of food Types of Digestion:Types of Digestion: –Mechanical: Chewing (Teeth and Tongue)Chewing (Teeth and Tongue) –Chemical: Saliva that contains enzymesSaliva that contains enzymes Molecules that are digested:Molecules that are digested: –Carbohydrates (Enzyme = Amylase) Swallowing Animation Swallowing Animation

7 Path of Digestion: Esophagus Path of Digestion: Esophagus Brings food from mouth to stomachBrings food from mouth to stomach –Food is now called a BOLUS Epiglottis:Epiglottis: –Flap of tissue at back of throat that prevents food from entering the wind- pipe Peristalsis:Peristalsis: –Wave-like contractions that move bolus to stomach Click Here for animation Click Here for animation

8 Path of Digestion: Stomach Path of Digestion: Stomach Further breaks down bolus for nutrient extractionFurther breaks down bolus for nutrient extraction Types of Digestion:Types of Digestion: –Chemical Digestion: Gastric juices (VERY ACIDIC) containing enzymes breakdown:Gastric juices (VERY ACIDIC) containing enzymes breakdown: –Continued digestion of Carbohydrates –First PROTEIN digestion –Mechanical Digestion: Churn, Churn, Churn!Churn, Churn, Churn! Bolus turned to CHYMEBolus turned to CHYME

9 Path of Digestion: Small Intestine Path of Digestion: Small Intestine Further breaks down chyme for nutrient absorption by blood stream –S–S–S–S.I. lined with tiny projections called VILLI –V–V–V–Villi contain capillaries that absorb nutrients into blood stream –N–N–N–Nutrients move into blood stream by what process (Think H to L!)? DIFFUSION!!!!!!!!! Type of digestion: –C–C–C–Chemical Only: Continued digestion of Carbohydrates Continued digestion of Proteins First FAT digestion

10 Helper Organs: The Video Clip

11 Helper (Accessory) Organs Helper (Accessory) Organs Food DOES NOT pass through these organsFood DOES NOT pass through these organs These organs secrete substances to aid in digestionThese organs secrete substances to aid in digestion Pancreas:Pancreas: –Secretes enzymes into S.I for digestion –Secretes a base into S.I. to neutralize stomach acid WHY?? So digestive enzymes arent denatured and can work!So digestive enzymes arent denatured and can work! Liver:Liver: –Produces and secretes BILE that breaks down fats Gall Bladder:Gall Bladder: –Stores the bile

12 Path of Digestion: Large Intestine Path of Digestion: Large Intestine Removes WATER from undigested chymeRemoves WATER from undigested chyme Lined with bacteria (E. coli)Lined with bacteria (E. coli) Proper water absorption is necessary to keep you regular!Proper water absorption is necessary to keep you regular! –Not enough water absorbed = DIARRHEA –Too much water absorbed = CONSTIPATION Final stop for undigested material…the anus!Final stop for undigested material…the anus!

13 Digestive System Fill-In

14 Digestive System Fill-In Answers


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