Presentation on theme: "Food Type Carbohydrate Fat Protein Use Long term energy Fast energy Protecting organs and long term energy store Making muscle, enzymes, skin, hair."— Presentation transcript:
Food Type Carbohydrate Fat Protein Use Long term energy Fast energy Protecting organs and long term energy store Making muscle, enzymes, skin, hair
Food tests Food type Protein Sugar Fat Carbohydrate Test Biuret turns purple if protein is present Benedicts turns from blue to red/brown if sugar is present Greaseproof paper gets an oily residue Iodine turns blue/black if starch is present
The Digestive System Buccal cavity Oesophagus Stomach Small Intestine Liver Large Intestine Gall Bladder Pancreas Rectum Anus (Breaking food down into smaller pieces)
Mouth (mechanical breakdown) Teeth Incisors used for cutting Canines used for stabbing and holding Molars large surface area used for grinding Tongue used for muscular activities and sensing the taste of food
Salivary Glands Produce saliva 1.Prevents bacterial infection 2.Lubrication 3.Contains salivary amylase Breaks down starch Three pairs 1.Parotid: Largest 2.Submandibular 3.Sublingual: Smallest
Oesophagus Approximately 25cm long Moves food from the throat to the stomach –Muscle movement called peristalsis If acid from the stomach gets in here thats heartburn.
Stomach Stores the food you eat Chemically breaks it down into tiny pieces Mixes food with digestive juices Acid in the stomach kills bacteria
Small Intestine Small intestines are roughly 6 metres long. Enzymes and bile are added. Villi increase the surface area to help absorbtion. Nutrients from the food pass into the bloodstream through the small intestine walls.
Liver Directly affects digestion by producing bile –Bile is an enzyme that helps dissolve fat Processes nutrients in the blood, filters out toxins and waste. Is often called the bodys energy factory
Gall Bladder Stores bile from the liver Delivers bile when food is digested Fatty diets can cause gallstones
Pancreas Produces compounds to digest fats and proteins Neutralizes acids that enter small intestine Regulates blood sugar by producing insulin
Large Intestine About 1.5 metres long Accepts what small intestines dont absorb. Absorbs water and minerals from the waste matter. Absorption means taking into the body via the blood stream.
Rectum and Anus Rectum –About 15cm long –Stores waste before egestion. Anus –Muscular ring that controls egestion.