GIT quiz questions Flashcards

1
Q

what does not directly enter the blood upon being absorbed from the digestive tract?

A

monoglycerides and free fatty acids

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2
Q

What stimulates gallbladder contraction?

A

Cholecystokinin (CCK)

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3
Q

What does not enter the duodenal lumen?

A

Disaccharidases

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4
Q

The primary factor responsible for moving the chyme forward in the S.I is?

A

A gradient in the frequency of segmentation along the length of the S.I

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5
Q

The gastroesophageal sphincter is normally closed to prevent:

A

gastric contents from refluxing into the esophagus

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6
Q

Correct stament about the colon

A

The colon contains about 10-fold more bacteria than the body has cells

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7
Q

What is absorbed by receptor-mediated endocytosis in the terminal?

A

Vitamin B12

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8
Q

Venous flow from the digestive tract into the liver is via the:

A

Hepatic portal vein

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9
Q

As food leaves the stomach, gastric secretion is reduced. Which of the following factors does NOT contribute to this reduction?

A

Beginning the next meal

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10
Q

Correct statement concerning HCI secretion by the stomach

A

(All) HCI kills microorganisms, HCI activates pepsinogen, HCI establishes a low pH in the stomach

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11
Q

Stimulation of saliva secretion by the conditioned reflex originates in:

A

Cerebral cortex

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12
Q

How does the topical agent pilocarpine increase salivation?

A

By acting on muscarinic receptors

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13
Q

If a person has dysphagia affecting the pharyngeal phase of swallowing, it is likely that:

A

The larynx does not elevate adequately

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14
Q

Reflux is caused by stomach contents entering the oesophagus. This can occur due to:

A

(All) Loss of tone to the lower oesophageal sphincter, decreased pressure in the oesophagus during breathing, An increase in intra-abdominal pressure

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15
Q

How does H. Pylori infection contribute to peptic ulcer formation?

A

Disrupting tight junctions

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16
Q

Biliary obstruction leads to jaundice by preventing removal of the waste product bilirubin. The most common cause of obstruction is:

A

Choleliths (gall stones)

17
Q

In Celiac disease there is blunting of microvilli. The following consequences would NOT impact digestion or absorption of nutrients:

A

Constipation

18
Q

Ulcerative colitis is characterised by chronic inflammation in the colon leading to diarrhoea. Diarrhoea is a function of:

A

Loss of control of fluid flux

19
Q

what are the 4 main layers of the GI tract?

A

mucosa, submucosa, muscularis externa, serosa