MCQ Lab 7 Digestion Flashcards

1
Q

The mixture of food structure resembles what?

A

The layers of an onion

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2
Q

Where do you find food that’s eaten first?

A

In the curvature major

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3
Q

Where do you find food that’s taken up last?

A

In the cardia

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4
Q

Where in the GI tract can you find the ptyalin enzyme?

A

In the stomach

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5
Q

What’s the completely mixed content of the stomach called?

A

The chymus

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6
Q

What substance act (activate the) on Parietal cells

A

Acetylcholine, histamine and Gastrin

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7
Q

What cells does Gastrin have an effect on?

A

Parietal cells

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8
Q

Which effect does acetylcholine have on Gastric SM cells?

A

Stimulating effect

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9
Q

Which gastric juice producing cells are influenced by Acetylcholine?

A

Parietal cells and ECL cells

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10
Q

Histamine acts on which receptors?

A

H2 receptors

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11
Q

How to measure the basal HCl concentration?

A

By titrating 0.01 M NaOH solution after adding a couple of drops of phenolphthalein

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12
Q

In what way does Verapamil inhibit muscle contraction?

A

By Ca2+ channel inhibition

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13
Q

Which muscle initiates smooth muscle contraction?

A

MLCK, Myosin Light Chain Kinase

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14
Q

What pathway does muscarinic Ach receptors activate?

A

G-protein phospholipase C pathway

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15
Q

What is ED50?

A

The concentration of the active ingredient, when the muscle contraction is half of its maximal.

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16
Q

The effects of acetylcholine is mediated by which type of receptors ?

A

The muscarinic Ach receptors

17
Q

What dissociates the Actomyosin complex?

A

Myosin phosphatase (MP) enzyme

18
Q

What’s included in the taste sensation pathway?

A

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

19
Q

What are the 4 basic tastes?

A

Sweet, salty, sour, bitter.

20
Q

Example of sweet tastes?

A

Sugars e.g. saccharine and saccharose

21
Q

Example of salty tastes

A

Neutral salts of strong acids and bases

22
Q

Examples of sour taste

A

Hydrogen ion dissociating molecules - buffers of saliva alters sensation

23
Q

Examples of bitter taste

A

Several alkaloids e.g. strychnine, quinine, several glycosides, ether, some Mg2+ and Ca2+ salts, ammonium compounds and sulphates.