Digestive System

Background Information Total length: 8-9 meters and 2/3 of this is the small intestine

Digestive System Sequence Lips  Tongue  Salivary Glands  Pharynx  Epiglottis  Esophagus  stomach  small intestines  large intestine  rectum  anus

Functions Lips: holds food in Teeth: chews up food Tongue: moves food around Salivary glands: produces saliva containing salt, mucus, amylase (starch) and lysozome (bacteria)  form a BOLUS

Functions (con’t) Pharynx: passage for food/air Epiglottis: covering for the glottis (opening to larynx) Esophagus: 25 cm. long; both voluntary and involuntary muscle

Stomach Storage and digestion 2 sphincter muscles: top- cardiac sphincter bottom- pyloric sphincter Lining secretes substances to break down food (i.e. HCl) Chyme: mixture produced by digestion in the stomach

Small Intestine Chemical digestion and absorb 3 sections: duodenum, jejunum, and ileum Surface contains microvilli (finger like projections) to move food along

Large Intestine Absorbs water and minerals Also called colon Different sections: ascending, transverse, descending and sigmoid

Accessory Organs Pancreas: produces enzymes that break down carbs, protein, lipids Liver: produces bile- dissolves fats; bile is stored in gallbladder

Movements Peristalsis: wavelike movement to move bolus toward stomach