digestive system

• What system breaks food down into simple forms?

  The digestive system converts the foods we eat into their simplest forms, like glucose (sugars), amino acids (that make up protein) or fatty acids (that make up fats). The broken-down food is then absorbed into the bloodstream from the small intestine and the nutrients are carried to each cell in the body
• All 3 digestive enzymes

  The main digestive enzymes made in the pancreas include: Amylase (made in the mouth and pancreas; breaks down complex carbohydrates) Lipase (made in the pancreas; breaks down fats) Protease (made in the pancreas; breaks down proteins)
• glucose molecules are combined together to make starch. explain why glucose is stared as starch? 


  Glucose is stored as starch because starch is a compact and stable form that can be easily broken down into glucose when needed for energy through digestion.
• The human digestive system has two functions:

  • breaks down complex food substances
  • provides the very large surface area for maximum absorption of food
• Where is protein digested in the human digestive system?

  stomach and small intestie
• Which chemical could be used to test if the burgers contain protein?

  biuret test
• where is bile produced?

  Produced by the Liver:
• what is the function of bile?

  assists enzymes (especially lipase) in fat digestion and creates optimal conditions for other digestive enzymes.
• what test would you do to test for sugars

  Benedict's test turns from blue to brick-red.
• what test would you do to test for fats?

  the emulsion test. To do this, you take the sample and mix it with equal volumes of ethanol and water followed by shaking. turns from clear to milky white if lipids are present.
• what test would you do for proteins?

  Biuret reagent turns from blue to purple.
• Name the three parts of the human digestive system that produce amylase.

  salivary gland, pancreas, small intestine
• What is the role of the mouth in digestion?

  The mouth breaks down food mechanically through chewing and chemically through saliva, which contains amylase to start starch digestion
• What is the function of the oesophagus?

  he oesophagus transports food from the mouth to the stomach through peristalsis (muscular contractions).
• What is the function of the stomach?

   The stomach secretes digestive enzymes and acid to break down food, especially proteins, and to kill harmful microorganisms
•  What enzymes are present in the stomach and what do they do?

  Pepsin breaks down proteins into amino acids, and hydrochloric acid provides the optimal pH for enzyme activity and helps kill bacteria.
•  How is the small intestine adapted for nutrient absorption?

  The small intestine has villi and microvilli, which increase surface area for absorption, and a rich blood supply to transport absorbed nutrients.
• What is the role of bile in digestion?

  Bile neutralizes stomach acid and emulsifies fats, breaking them into smaller droplets for easier digestion by lipase.
•  What is the role of the pancreas in digestion?

   The pancreas produces digestive enzymes, including amylase, lipase, and protease
• Where are nutrients absorbed in the body?

  Nutrients are absorbed in the small intestine, specifically in the villi and microvilli.
• Explain why this person would have difficulty digesting fat.

  less bile reaches the small intestine (so) less emulsification of fat (so) smaller surface area for lipase to break down fat pH of small intestine is not neutralised (so) lipase is not at its optimum pH to break down fat.