Lab 7 past Qs

Question 1

What substances taste salty?

Answer 1

(neutral salts of strong acids and bases)

Question 2

What effect has verapamil?

Answer 2

Ca2+channel inhibitor

Question 3

Effects of acetylcholine ismediated by which type of receptors?(

Answer 3

muscarine Ach receptors

Question 4

Which effect has acetylcholine on gastric SM?()

Answer 4

stimulating

Question 5

Which gastric juice producing cells are influenced by Acetycholine?(

Answer 5

Parietal Cells

Question 6

What enzyme initiates SM contraction?

Answer 6

MLCK = Myosin Light Chain Kinase

Question 7

What pathway does muscarinic Ach receptors activate?

Answer 7

G-protein phosphlipase C pathway

Question 8

ED50?

Answer 8

Active ingredient concentration needed for half maximal muscle contraction

Question 9

Examples of bitter taste?

Answer 9

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

Question 10

Examples of sour taste?

Answer 10

hydrogen ion dissociating molecules –buffers of saliva alters sensation

Question 11

What dissociates the actomyosin complex?

Answer 11

myosin phosphatase (MP) enzyme

Question 12

How to measure the basal HCl consentration?

Answer 12

by titratin 0.01 M NaOH, after adding phenophtalein

Question 13

Where can you find the food eaten last?

Answer 13

in the cardia

Question 14

Which cells does gastrin have effect on?

Answer 14

parietal cells

Question 15

In which way does verapamil inhibit muscle contraction?

Answer 15

Ca2+channel inhibition

Question 16

What substance act on pariental cells?

Answer 16

Acetylcholine, Histamine and Gastrin

Question 17

Where in gastrointestinal tract does ptyalin act?

Answer 17

in the stomach

Question 18

Mixture of stomach content is called?

Answer 18

Chymus

Question 19

The mixture of food structure resembles what?()

Answer 19

onion

Question 20

The taste pathway?

Answer 20

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