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Mouth A. Function: Begins the digestive process Amylase in saliva breaks down starches (complex carbohydrates) Increases the surface area of food to be more easily digested B. Type of Digestion Chemical digestion – saliva = amylase (also known as ptyalin) that changes starches to simple sugars Saliva is a digestive enzyme Mechanical digestion – teeth break apart food. Proteins and fats only undergo mechanical digestion. - incisors (front teeth) bite into food - molars – grind and crush food - canines – shred food C. Connects Connects to the esophagus Esophagus A. Function To carry food from the mouth to the stomach Slippery mucus helps the food go down the esophagus Peristalis (a wave like motion) moves the food down to the stomach B. Type of Digestion Some mechanical from the peristalsis motion C. Connects Connects the mouth to the stomach Stomach A. Function As food enters the stomach, gastric juice is released Gastric juice contains pepsin, hydrochloric acid and mucus Pepsin is an enzyme HCl activates the pepsin which breaks down proteins Carbohydrates and fats are broken down by the muscular contractions BUT not by chemicals secreted in the stomach. Mucus protects the walls of the stomach Chyme – the food is converted into a thick, milk shake-like liquid in the stomach Pyloric sphincter – the opening to the small intestine B. C. Types of Digestion Mechanical – stomach muscles Chemical – HCl acid + pepsin = gastric juice Connects Esophagus to the small intestine Small Intestine A. Function 2.5 cm in diameter and 6 meters long food moves through the intestine by peristalsis most digestion takes place here intestinal enzymes digest fats, carbohydrates, proteins most digestion takes place in the first 30 cm of the small intestine digestive helper organs secrete enzymes into the small intestine - liver - gall bladder - pancreas - B. Villi (finger like projections) help increase the absorption of nutrients into the bloodstream Type of Digestion - Chemical – digestive juices from the live, gall bladder and pancreas - Mechanical – perstalsis moves the food C. Connects - Stomach to the large intestine Large Intestine A. Function Indigested food, water, mucus, bile salts, and scraped-off intestinal cells go into the large intestine Bacteria feed on the leftovers and make certain vitamins ( Vitamin K and the B complex vitamins) Water and minerals are absorbed back into the body 6.5 cm wide and 1.5 meters long materials not absorbed in the large intestine become solid waste (feces) rectum stores waste appendix is located on the large intestine fiber helps keep the waste moving through the large intestine (no constipation) B. Type of Digestion Mechanical – peristalsis Chemical – bacteria breaks down the leftover food C. What it connects to Connects to the small intestine Pancreas (digestive helper) A. Function Produces enzymes that are released into the small intestine that digest fats, carbohydrates and proteins Secretes 1.5 liters of juice a day Juice is basic Breaks fats down into fatty acids and glycerol Breaks complex carbohydrates into simple sugars Breaks proteins into amino acids Producs insulin to control the sugar level in the body B. Type of Digestion Aids in chemical digestion in the small intestine C. Where is it Located? Between the stomach the small intestine Liver (digestive helper) A. Function Aids in digestion by producing bile that is stored in the gall bladder Produces bile that is used secreted into the small intestine to digest fats The bile breaks fats down into fat droplets Largest and heaviest organ B. Type of Digestion Aids in chemical digestion in the small intestine by producing bile C. Where is it Located? Located to the right of the stomach Connected to the gall bladder which secretes bile into the small intestine Gall Bladder (digestive helper) A. Function Stores bile that is manufactured in the liver The gall bladder releases bile into the small intestine to break down fats Bile breaks down fats into large fat droplets so juices from the small intestine and enzymes from the pancreas mix more easily with the fat Fats are eventually broken down into fatty acids and glycerol Bile is a yellowish-greenish liquid B. Type of digestion Aids in chemical digestion in the small intestine C. Where is it Located? Between the liver and the small intestine