Explain the differences between mechanical digestion and chemical digestion?
481263
mechanical is through the use of your teeth.  chemical is the breakdown of food via your stomach acids.
159698
Do you just swallow your food? U yourself smash your food. Then the enzymes in our body'll digest it after separating the nutrients as Carbohydrates,fats etc.\n\nFor the purpose of separation & digestion food has to be broken down.
859386
Due to differences in chemical structures
701331
digesting food=chem since youre breaking it down into ammino acids, carbs, etc.\n\nchewing= phys since all you are doing is breaking it into smaller pieces\n\nrusting= chem since iron is turning into iron oxide\n\ndissolving= phys since youre basically just mixing up the sugar and making it into smaller pieces. now if it was an ion like salt that disassociates i think it would be chemical since NaCl -> Na+ and Cl-
852649
Here's a website on the process of digestion, in very simplistic terms.\n\nhttp://digestive.niddk.nih.gov/ddiseases/pubs/yrdd/\n\nNot sure how detailed you need chemical reactions, but:\n\nCarbs: begin in the mouth (but mainly in small intestine), salivary amylase hydrolyzes starch into maltose. The gastric juices in the stomach inactivates the amylase (pH too acidic), and starch completes in the small intestine via pancreate amylase. Maltose is a dissacharide which breaks down into monosaccharides (glucose) via intestinal enzymes (maltase and lactase).\n\nFats: occurs in small intestines via lipases (secreted by the pancreas). First, they need to be emulsified (increase surface area) via bile from the liver (has bile salts). Lipases then convert lipids into fatty acids and monoglycerides which are absorbed into the blood in the small intestine.\n\nProteins: starts in the stomach and completes in small intestine. Stomach has proteolytic enzymes (pepsins) which breaks proteins down to smaller peptides, which are broken down into amino acids via pancreatic enzymes (trypsin, chymotrypsin, and carboxypeptidases) into dipeptides and amino acids.
51022
Throughout the whole digestion process, food will pass from your mouth to your stomach before finally being processed into waste and expelled from the rectum. You are right that there are two types of digestion that there are two types of digestion, mechanical and chemical. Mechanical include such action as the breaking down of food by chewing with your teeth that forms the food into a pulp and also throughout your whole digestive tract peristalsis helps through the contraction of your intestine, throat and stomach to help food pass through. Chemical digestion involves breaking down of food through chemical means like the amilayse enzyme from salive that coverts starch into maltose. Stomach acids, bile, lipase and various other chemicals secreted by the various organs also include chemical digestion.
758287
1.) The food you eat is softened by enzymes in your saliva. Your teeth chew and grind the food. Your tongue is used to toss the food.\n2.) The food goes down the trachea. It enters the stomach. The stomach contains an acid called hydocloric acid. This acid can burn a whole through a carpet. It is used to digest food.\n3.) The bile in the liver helps remove any harmful particles from the food. The liver also stores some of the food.\n4.) The food goes through the intestines. The pancreas releases pancreatic juice into the small intestine to further digest the food.\n5.) Some of this food is used for energy and carried to cells through capilaries. The "not needed" part of the food goes through the exit of your body. You secrete this as solid waste called feces. \n_________________________________\nHope this helps! :) :) :) :)
1036412
try this\n\nhttp://en.wikipedia.org/wiki/Hydrolysis
241453
Introductory Anatomy: Digestive System\nDr D.R.Johnson, Centre for Human Biology\nPurpose\n\nThe digestive system prepares food for use by hundreds of millions of body cells. Food when eaten cannot reach cells (because it cannot pass through the intestinal walls to the bloodstream and, if it could would not be in a useful chemical state. The gut modifies food physically and chemically and disposes of unusable waste. Physical and chemical modification (digestion) depends on exocrine and endocrine secretions and controlled movement of food through the digestive tract.\n\nMouth\n\nMouth Food enters the digestive system via the mouth or oral cavity, mucous membrane lined. The lips (labia) protect its outer opening, cheeks form lateral walls, hard palate and soft palate form anterior/posterior roof. Communication with nasal cavity behind soft palate. Floor is muscular tongue. Tongue has bony attachments (styloid process, hyoid bone) attached to floor of mouth by frenulum.\nPosterior exit from mouth guarded by a ring of palatine/lingual tonsils. Enlargement = sore throat, tonsillitis. \nFood is first processed (bitten off) by teeth, especially the anterior incisors. Suitably sized portions then retained in closed mouth and chewed or masticated (especially by cheek teeth, premolars, molars) aided by saliva Ducted salivary glands open at various points into mouth. This process involves teeth (muscles of mastication move jaws) and tongue (extrinsic and intrinsic muscles). Mechanical breakdown, plus some chemical (ptyalin, enzyme in saliva). Taste buds allow appreciation, also sample potential hazards (chemicals, toxins)\n\nSwallowing\n\nIn leaving the mouth a bolus of food must cross the respiratory tract (trachea is anterior to oesophagus) by a complicated mechanism known as swallowing or deglutination which empties the mouth and ensures that food does not enter the windpipe. \nSwallowing involves co-ordinated activity of tongue, soft palate pharynx and oesophagus. The first (buccal) phase is voluntary, food being forced into the pharynx by the tongue. After this the process is reflex. The tongue blocks the mouth, soft palate closes off the nose and the larynx rises so that the epiglottis closes off the trachea. Food thus moves into the pharynx and onwards by peristalsis aided by gravity. If we try to talk whilst swallowing food may enter the respiratory passages and a cough reflex expels the bolus.\n\nOesophagus\n\nThe oesophagus (about 10") is the first part of the digestive tract proper and shares its distinctive structure. Basic tissue layers of the gut are \n1. mucosa. Innermost, moist lining membrane. Epithelium (friction resistant stratified squamous in oesophagus, simple beyond) plus a little connective tissue and smooth muscle. \n2. submucosa. Soft connective tissue layer, blood vessels, nerves, lymphatics \n3. muscularis externa. Typically circular inner layer, longitudinal outer layer of smooth muscle \n4. serosal fluid producing single layer.\n\nStomach\n\nC shaped, left side abdominal cavity (because liver is on right). Cardioesophageal sphincter guarding entrance from oesophagus is of doubtful anatomical integrity (though functionally the diaphragmatic pinch cock serves). Pyloric sphincter guarding the outlet is much better defined. Fundus, body and pylorus recognised as distinct regions. Stomach secretes both acid and mucus (for self protection). Surface area increased by rugae. Serves as a temporary store for food which is also churned by muscular layers (three here) to form chyme, creamy substance voided via pyloric sphincter to duodenum\n\nDuodenum\n\nFirst part of small intestine. C shaped 10" long and curves around head of pancreas and entry of common bile duct (accessory organs of digestion, pancreas, liver see below). Chemical degradation of small controlled amounts of food controlled by pyloric sphincter begins here, enzymes secreted by pancreas and duodenum itself aided by emulsifying bile (which also
424442
Liquid is absolutely better! Your body will not need to metabolise it since it's already in liquid form. It can be immediately absorbed. Capsule form requires digestion.
675012
Look here:  http://www.analytictech.com/mb021/organic_vs_mechanistic_structure.htm
862964
chemical digestion is where your stomach dissovles the food in your mouth by saliva, or when the enzymes and bile break it down in the stomach.\n\nmechanical digestion is when you chew the food using your teeth, adn when your esophagus swallows the food using perastalsis.
444550
The difference in solubility of the components allows for separation.  I don't remember the specifics, but that is the reason.  Water will not have a big enough difference.
950352
Enzymes are catalysts that speed up chemical reactions \n\nLipase- is an enzyme that is used by the body to break down dietary fats into an absorbable form\nPepsin- enzyme is produced in the mucosal lining of the stomach that acts to degrade protein\nAmylase- is a digestive enzyme classified as a saccharidase -an enzyme that cleaves polysaccharides.\nThe sugar maltose is made from two glucose molecules bonded together. The enzyme maltase is shaped in such a way that it can break the bond and free the two glucose pieces. The only thing maltase can do is break maltose molecules, but it can do that very rapidly and efficiently.
1022011
This website includes MANY answers to your question, I think.  I'm a Chemical Engineer, so this isn't quite up my alley, but I think this will help!\n\nhttp://www.healthatoz.com/healthatoz/Atoz/ency/malabsorption_syndrome.jsp
878305
A kinetically stable substance has a high activation eregy barrier that prevents it from reacting quickly unless a large amount of energy is supplied.\nA thermodynamically stable substance has an exothermic enthalpy of formation, or has no other substances of lower energy into which it can decompose.
922983
lol chem... anyway a physical change is one that only effects apperence such as a paper ripping or adding paint to a wall. a chemical change changes what something is compleatly like burning paper changes it into ash