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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