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Slide 1 - The Alimentary Canal Standard Grade Biology
Slide 2 - Can you sort out the statements into True and False? Carbohydrates, proteins and fats are all made up of carbon, hydrogen, nitrogen and oxygen. Starch is a large carbohydrate molecule Fats are made up of smaller units called amino acids Proteins are made up of one or more glucose molecules Starch molecules can be broken down by amylase. Proteins are important for the growth and repair of cells
Slide 3 - Can you name the 2 different ways we breakdown food in our bodies? Mechanical Digestion -teeth Chemical Digestion -enzymes -bile -stomach acid
Slide 4 - 1. Parts of The Alimentary Canal The alimentary canal (or gut) is the tube within the body through which food passes and is processed in various ways
Slide 5 - mouth salivary glands oesophagus liver stomach pancreas large intestine small intestine anus
Slide 6 - 2. Role of the Mouth Salivary gland Salivary gland Salivary gland Saliva is mixed with food during chewing Teeth assist the mechanical breakdown of food Saliva contains the enzyme amylase which starts the digestion of food Saliva contains mucus that keeps the mouth moist and lubricates food for easier swallowing
Slide 7 - 3. Muscles of the Alimentary Canal Food has to be kept moving along the alimentary canal whilst being mixed with various juices These actions are brought about by muscles in the walls of the canal over which a person has little or no conscious control
Slide 8 - 3. Peristalsis The squeezing action of muscles that is used to move food along the alimentary canal http://www.lionden.com/peristalsis.htm
Slide 9 - Digestive Enzymes What do the following enzymes breakdown? What do they break the large moleculs down into? Amlyases Lipases Proteases
Slide 10 - Digestion ‘the breakdown of large insoluble molecules into soluble molecules’
Slide 11 - Digestion and Digestive Juices Saliva PANCREATIC JUICE GASTRIC JUICE Bile INTESTINAL JUICE
Slide 12 - Sites of production of main digestive juices
Slide 13 - Digestion and Digestive Juices SALIVA Salivary amylase PANCREATIC JUICE Pancreatic lipase GASTRIC JUICE Hydrochloric acid Pepsin (protease) Bile INTESTINAL JUICE
Slide 14 - In the Mouth… Starch maltose Broken down into glucose later by other amylases Salivary amylase
Slide 15 - In the stomach Protein peptides Broken down into amino acids later by other proteases pepsin
Slide 16 - In the pancreas…. Fats fatty acids and glycerol Pancreatic lipase
Slide 17 - After all the digestive enzymes have done their work… Glucose Amino acids Fatty acids Glycerol
Slide 18 - Finish the sentence…. Something new I learnt today was….. Something I found difficult to understand was… The thing I need to revise from today’s lesson is…
Slide 19 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.