Lab 8 questions

Question 1

What substances taste salty?

Answer 1

(neutral salts of strong acids and bases)

Question 2

Histamine acts on which receptors?

Answer 2

(H2 receptors)

Question 3

What effect has verapamil? (

Answer 3

Ca2+ channel inhibitor)

Question 4

Effects of acetylcholine is mediated by which type of receptors?

Answer 4

(muscarine Ach receptors)

Question 5

Which effect has acetylcholine on gastric SM?

Answer 5

stimulating

Question 6

Which gastric juice producing cells are influenced by Acetycholine?

Answer 6

(Parietal Cells)

Question 7

Which gastric juice producing cells are influenced by Acetycholine?

Answer 7

(Parietal Cells)

Question 8

What enzyme initiates SM contraction?

Answer 8

(MLCK = Myosin Light Chain Kinase)

Question 9

What pathway does muscarinic Ach receptors activate?

Answer 9

(G-protein phosphlipase C pathway)

Question 10

ED50?

Answer 10

(Active ingredient concentration needed for half maximal muscle contraction)

Question 11

Examples of bitter taste?

Answer 11

(several alkaloids: strychnine, quinine, several glycosides, ethers, some Mg2+ and Ca2+ salts, ammonium compound and sulphates)

Question 12

Examples of sour taste?

Answer 12

(hydrogen ion dissociating molecules – buffers of saliva alters sensation)

Question 13

What dissociates the actomyosin complex?

Answer 13

(myosin phosphatase (MP) enzyme)

Question 14

How to measure the basal HCl consentration?

Answer 14

(by titratin 0.01 M NaOH, after adding phenophtalein))

Question 15

Where can you find the food eaten last?

Answer 15

(in the cardia)

Question 16

Which cells does gastrin have effect on?

Answer 16

(parietal cells)

Question 17

In which way does verapamil inhibit muscle contraction?

Answer 17

(Ca2+ channel inhibition)

Question 18

What substance act on pariental cells? (

Answer 18

Acetylcholine, Histamine and Gastrin)

Question 19

Where in gastrointestinal tract does ptyalin act?

Answer 19

(in the stomach)

Question 20

• Mixture of stomach content is called?

Answer 20

(Chymus)

Question 21

• The mixture of food structure resembles what?

Answer 21

(onion)

Question 22

• The taste pathway?

Answer 22

(fascial (VII), glossopharyngeal (IX) and vagus (X) are involved)