biology digestive system

• what is glucose used for in the body?

  as source of energy
• what is the chemical test for the presence of starch?

  iodine
• What does lipase break down?


  Facts and Oils
• Where is bile produced?

  Liver
• What happens in a large intestine?

  water is absorbed from the remaining undigested food
• It’s a sample of food tested positive for glucose in the Benedicks test. What color would it turn?


  Orange or red
• What food group is provided by fruits and vegetables?

  vitamins and minerals
• What is the purpose of digestion?

  Break down large insoluble molecules into small soluble molecules
• What is the name of the model that describes how enzymes work?

  Lock and key
• Why do large molecules need to be broken down for digestion?

  So they are small enough to be absorbed into the bloodstream and use a variety of functions
• How do you test for glucose?

  Use Benedict solution and put sample into a water bath at 80°C
• what color is a positive result for glucose?


  Blue to green to orange to bright red
• How do you test for protein?

  Add biuret A and B to food sample
• What color does the food sample go if protein is present?

  light blue to Violet
• Where is bile stored?

  In the gallbladder
• What are the functions of hydrochloric acid in the stomach?

  It kills bacteria and provides the optimum pH
• What does digestion start?

  The mouth
• What is the role of the small intestine?

  Complete digestion of proteins amino acids
• What is the name of the muscular tube which absorbs nutrients


  Small intestine
• What is the role of the oesophagus?

  force food along the esophagus, and through the gut
• What is carbohydrates broken down by

  Carbohydrase
• What is protein broken down by?

  Protease
• What is lipids and fat, broken down by

  Lipase
• Why is iron important in the diet?

  Is used to make hemoglobin in the blood
• How does bio aid the digestion of fats and oils?

  It’s an emulsifier it increases the surface area of the fat and increases the pH to the optimum lipase
• What is the product of protease as it digest proteins?

  Amino acids