IGCSE Biology - Digestive system-Questions and Answers Graded A+
IGCSE Biology - Digestive system-Questions and Answers Graded A+ digestive system - ANSWER-body system the breaks down food and absorbs nutrients Digestion - ANSWER-Breakdown of food substances into simpler forms that can be absorbed and used Oesophagus - ANSWER-Tube connecting the mouth to the stomach stomach - ANSWER-large muscular sac that continues the mechanical and chemical digestion of food small intestine - ANSWER-Digestive organ where most chemical digestion and absorption of food takes place large intestine - ANSWER-Absorbs water and forms feces duodenum - ANSWER-first part of the small intestine ileum - ANSWER-the last and longest portion of the small intestine Pancreas - ANSWER-An organ with two roles. The first is to produce digestive enzymes which are delivered to the small intestine via the pancreatic duct. The second is an to secrete insulin and glucagon into the bloodstream to help regulate blood glucose levels. liver - ANSWER-produces bile and stores glycogen Bile - ANSWER-A substance produced by the liver that breaks up fat particles. gall bladder - ANSWER-stores bile produced by the liver until it is needed in the duodenum emulsification - ANSWER-physical process of breaking up large fat globules into smaller globules, thereby increasing the surface area that enzymes can use to digest the fat Enzyme - ANSWER-protein that acts as a biological catalyst catalyst - ANSWER-substance that speeds up the rate of a chemical reaction active site - ANSWER-a region on an enzyme that binds to a protein or other substance during a reaction. Substrate - ANSWER-The reactant on which an enzyme works.
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