Test 5 Part 1

  1. digestion begins in the mouth. why?
    • 1) mechanical destruction of food
    • 2) breakdown of carbohydrates by salivary amylase
  2. what is occlusion?
    the precise fitting together of the teeth
  3. where is the esophagus?
    • it begins at the end of the pharynx
    • passes posterior to the trachea through the chest
    • enters the abdomen through the hiatus of the diaphragm
  4. what are 5 things that keep stomach acid from digesting our body?
    • lower esophageal sphincter
    • pyloric valve
    • rapid turn-over of cells lining the stomach
    • thick alkaline mucus
    • tight junctions between cells of stomach
  5. glands in the stomach are named by location. what are they?
    • cardiac
    • gastric
    • pyloric
  6. why are they (glands of stomach) named for their function?
    they all have more than one secretory product
  7. how is stomach acid produced?
    hydrogen ions and chloride ions are released separately from parietal cells in gastric glands
  8. what else is produced by parietal cells and why is it important?
    • intrinsic factor- binds vitamin B12
    • without which it could not be absorbed
  9. what is the role of acid in digestion?
    • activates salivary lipase
    • inactivates salivary ampylase
    • activates pepsin
    • makes iron absorbable 
    • breaks down connective tissue and plant cell walls 
    • kills bacteria 
  10. gastrin is produced by ______.
    G cells in pyloric glands
  11. gasgrin release is stimualted by _______.
    small peptides and amino acids
  12. gastrin does what?
    causes acid secretion and release of pepsin
Card Set
Test 5 Part 1