Back to quiz

6. What carbohydrate digestion occurs in the stomach

  • only mechanical and liquefaction
  • a-amylase hydrolyses starch in stomach
  • enzymatically by lingual and gastric lipase
  • all digestion occurs here

7. What does the pyloric sphincter do

  • regulates entry of chyme into duodenum
  • activates gastric emptying
  • regulates churning of gastric walls
  • facilitates segmentation

8. How does pepsinogen lead to protein digestion

  • Activated by HCl to cleave interior protein bonds
  • Activated by pH>5 to active pepsin, cleaves interior peptide bonds
  • Activated by pH< 5 to active pepsin, cleaves interior peptide bonds
  • Activated by existing pepsin to hydrolyse proteins

9. What 2 things does the low pH of the stomach do

  • Both
  • denatures proteins to release bound iron and nutrients
  • pH2 inhibits the action of a-amylase

10. Describe the strong mechanical action

  • smooth muscle contracts and mixes food with gastric juice
  • 3 layers of muscle contracts to grind food down
  • the gastric folds move to produce gastric juice
  • peristalsis churns food to produce chyme

11. Which nutrients are absorbed in the stomach

  • Chyme
  • Only alcohol
  • Digested starch and proteins
  • Nothing is absorbed here

12. Which nutrients can be bound to proteins

  • fibre
  • iron and other minerals
  • lipids
  • starch

13. At what rate does chyme exit the pylorus through the pyloric orifice

  • 6ml every 30secs
  • 1-2l twice per minute
  • 1-3ml twice per minute
  • 2-3ml every minute