8 a food & digestion (whs)

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Information about 8 a food & digestion (whs)

Published on March 31, 2014

Author: PreetiGhosh2

Source: slideshare.net

30/03/2014 Food and Digestion

30/03/2014 Food types Type Found in Uses Carbohydrates Fats Proteins Vitamins Minerals Fibre Water Bread, potatoes, cereal Cream, butter, milk, oil Meat, fish, eggs Vegetables, cereal Meat, milk, cereal Fruit + veg, cereal Water! Energy A store of energy Building and repairing cells Make chemicals in body. Keep you healthy. Strong Teeth, Immune system. 75% of the body is water Keeps you regular!

30/03/2014 Food tests 1 To investigate what happens in digestion we need to be able to test for different foods. Here are two simple tests: 1) The test for starch: Drop some iodine onto the food. If the iodine turns BLUE/BLACK then STARCH is present. 2) The test for simple sugars (e..g glucose) Boil the food with some Benedict’s solution. If an orange “precipitate” appears then the food contains simple sugars Iodine

30/03/2014 Food tests 2 1) The test for protein: Add 5cm3 of dilute sodium hydroxide followed by 5cm3 of dilute copper sulphate. If protein is present it will produce a purple colour. 2) The test for fats: Shake the food with about 10cm3 of ethanol in a test tube. Pour some of the solution into a tube containing water. If fat is present the water will turn cloudy white.

30/03/2014 The digestive system The whole point of digestion is to break down our food so that we can get the bits we need from it… The main foods affected are CARBOHYDRATES – these are broken down into GLUCOSE

30/03/2014 Enzymes Enzymes are chemicals produced by the body to help _______. When they react with food they break it down into ______ pieces which can then pass into the ______: Carbohydrase breaks _______ (a carbohydrate) down into glucose: Protease breaks _______ down into amino acids: Lipase breaks fats (_____) down into fatty acids and glycerol: Words – blood, lipids, proteins, digestion, starch, smaller

30/03/2014 The small intestine This is where the “small parts” are absorbed into our blood stream… Glucose gets absorbed into the blood Everything else passes into the large intestine

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