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Digestion: Fact sheet.

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Digestion: Fact sheet Introduction Digestion means that large food molecules are broken down into smaller ones, which can be dissolved and broken down into food group such as: * Proteins * Fats * Starch * Carbohydrate's * Vitamins * Minerals * Fibres This all happens inside the gut where food is mixed with enzymes. Proteins, Fats and Carbohydrates have to be digested before the body can use them because they're made of large complicated molecules. Once they've been digested they're small enough to pass through the gut wall and into the blood this is called absorption. Vitamins and minerals don't have to be digested because they're small enough to pass through the gut wall and into the blood. Fibre can't be digested because humans don't make the right enzymes for this to take place. And the molecules are too big to pass through the gut wall so it stays inside the gut and makes up most of the faeces. (Below is a example of how enzymes breakdown food molecules) ...read more.


Food groups What does it do? Found in... Carbohydrate's It gives us energy (acts as a fuel in respiration). Sugary Foods. E.g. Sweets, Soft Drinks, Starch Foods. E.g. Bread, Potato, Rice, Pasta Protein Make new cells E.g. For growth and repair. Meat, Fish, Eggs, Milk, Cheese, Beans and nuts. Fat Gives energy and acts as a fuel in respiration. Fried Foods, E.g. Chips, Crisps, Butter, Margarine, Cheese, Nuts, Chocolate, Red Meat. Vitamins E.g. Vitamin C E.g. Vitamin D Keeps the body healthy. Keeps the skin and gums healthy. Keeps the bones and the teeth healthy. Oranges, Blackcurrants, Potatoes, Green Vegetables. Fish, Eggs, Liver. Minerals E.g. Iron E.g. Calcium Keeps the body healthy. Makes red blood cells. Keeps bones and teeth healthy. Red Meat, Green Vegetables, Cocoa. Wholemeal Bread, pasta, Brown Rice, Fruit, Vegetables. Fibre Keeps the gut healthy and helps to avoid constipation. (Having trouble with egesting) Wholemeal Bread and Pasta, Brown Rice, Fruit, Vegetables Starch Glucose (Polysaccharide) Fats Amino Acids (Energy store, Insulation, cell membrane) * Glycerol * Fatty acids Protein Amino Acids (Growing) ...read more.


E.g. Carbohydrates changed into fats, and minerals stored. It makes bile for breakdown of fats and destroys poisons like alcohol and drugs. The excess protein is made into Urea in the liver. It also contains stored Carbohydrates, which are used to keep the blood sugar level steady. Large Intestine Once food reaches the large intestine all useful substances have been digested and absorbed, so only the faeces remain. As they pass through the large intestine water is absorbed and faeces is stored inside the rectum before being pushed outside the body through the anus. Describing absorption (Conclusion) Absorption is when small food molecules move through the gut wall and into the blood. E.g. Proteins, Carbohydrates, and Fats. Which have to be digested before they can be absorbed, but some are by now small and don't require to be digested. E.g. Vitamins, minerals, and various sugars. Absorption occurs in the Ileum (Small intestine). The finger like spikes called the Villi; provide surface area to enlarge the effectiveness of absorption. Food is absorbed into the blood, and then it is taken straight to the liver to be processed into food groups. ...read more.

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