Lab 8 questions Flashcards
What substances taste salty?
(neutral salts of strong acids and bases)
Histamine acts on which receptors?
(H2 receptors)
What effect has verapamil? (
Ca2+ channel inhibitor)
Effects of acetylcholine is mediated by which type of receptors?
(muscarine Ach receptors)
Which effect has acetylcholine on gastric SM?
stimulating
Which gastric juice producing cells are influenced by Acetycholine?
(Parietal Cells)
Which gastric juice producing cells are influenced by Acetycholine?
(Parietal Cells)
What enzyme initiates SM contraction?
(MLCK = Myosin Light Chain Kinase)
What pathway does muscarinic Ach receptors activate?
(G-protein phosphlipase C pathway)
ED50?
(Active ingredient concentration needed for half maximal muscle contraction)
Examples of bitter taste?
(several alkaloids: strychnine, quinine, several glycosides, ethers, some Mg2+ and Ca2+ salts, ammonium compound and sulphates)
Examples of sour taste?
(hydrogen ion dissociating molecules – buffers of saliva alters sensation)
What dissociates the actomyosin complex?
(myosin phosphatase (MP) enzyme)
How to measure the basal HCl consentration?
(by titratin 0.01 M NaOH, after adding phenophtalein))
Where can you find the food eaten last?
(in the cardia)
Which cells does gastrin have effect on?
(parietal cells)
In which way does verapamil inhibit muscle contraction?
(Ca2+ channel inhibition)
What substance act on pariental cells? (
Acetylcholine, Histamine and Gastrin)
Where in gastrointestinal tract does ptyalin act?
(in the stomach)
- Mixture of stomach content is called?
(Chymus)
- The mixture of food structure resembles what?
(onion)
- The taste pathway?
(fascial (VII), glossopharyngeal (IX) and vagus (X) are involved)
