Digestive System Chapter 39-2 yes That’s wrong nope

Mouth Function Mechanical Digestion – breakup of food Beginning of Chemical Digestion Saliva from Salivary Gland

Esophagus Function Rhythmic contraction of muscle rings in wall push food to the stomach (Peristalsis)

Stomach Function Food mixes together and becomes Chyme A mixture of food and chemicals Chemical Digestion (Acid and other chemicals break down food)

Small Intestine Function Most nutrient absorption takes place here! Enzymes that work in the small intestine also come from the pancreas and liver. Basic environment (not acid, base) helps neutralize acid from stomach. As chyme enters the duodenum: Carbohydrates and proteins are only partially digested No fat digestion has taken place

Liver Function Secretes Bile into beginning of small intestine Helps to break down fats by preventing their sticking together Not an Enzyme! Works like dish-washing soap The Gall Bladder stores the bile

Chemical Digestion: Fats Like soaping your body! Or the dishes! Figure 23.35

Pancreas Function Secretes Sodium Bicarbonate base that neutralizes acid in small intestine Many chemicals used in digestion come from the pancreas Hidden behind stomach

Large Intestine (Colon) Function Removes water from undigested material What happens when not enough water is removed? Some bacteria live here Breakdown indigestible carbohydrates (lactose) Release irritating acids and gases (flatus) Synthesize B complex vitamins and vitamin K