B3

• What is a tissue

  A group of cells with a similar structure and function
• What is an organ


  A group of different tissues that preform a specific function together
• What is an organ system


  A group of organs that work together to carry out a process in the body
• What is the function of the digestive system

  An organ system in which several organs work together to digest and absorb food
• What are enzymes


  Biological catalysts with a specific active site that speeds up reactions
• How do enzymes work

  The substrate fits into the active site of the enzyme and the enzyme and substrate binds together. Speeding up the rate of reaction and releasing broken down products
• What effect does temperature have on enzyme activity

  At temperature increases the rate of reaction increases

  At optimum temperature the reaction works as fast as possible

  After optimum temperature the enzyme denatures and stops working
• How are enzymes denatured by temperature

  The high temperature causes the protein chains to unravel changing the shape of its active site
• Why do enzymes have an optimum pH

  The forces holding the protein chains together are affected by pH, change of pH changes the shape of the active site
• Where is amylase made in the body

  Salivary glands

  Small intestine

  Pancreas
• What is the function of amylase

  Break down starch into glucose (simple sugars)
• Where is protease made in the body

  Stomach

  Small intestine

  Pancreas
• What is the function of protease


  Break down proteins into amino acids
• Where is lipase made in the body

  Pancreas and small intestine
• What is the function of lipase


  Break down lipids into fatty acids and glycerol
• What is the function of digestive enzymes

  Convert food into small soluble molecules that can be absorbed into the blood stream
• What are products of digestion used for?

  Build new carbohydrates, lipids, and proteins.

  Some glucose is used in respiration
• Where is starch digested in the body

  Mouth and small intestine
• Where is protein digested in the body

  Stomach and small intestine
• Where are fats digested in the body

  Small intestine
• Why is starch not digested in the stomach

  The stomach doesn't produce amylase and the conditions in the stomach are too acidic for the amylase to work
• How can the mouth break down starchy foods

  The teeth can grind the food

  Saliva contains amylase
• Where is bile made

  The liver
• Where is bile stored

  Gall bladder
• What is the function of bile

  It is alkaline to neutralise hydrochloric acid from the stomach. It also emulsifies fat from small droplets which increases the surface area

  Increasing breakdown of fat by lipase.