Self-test questions: Chapter 44

. Salivary secretion is stimulated by the activity of the parasympathetic nerves and inhibited by the sympathetic nerves.

True

False

. Regarding salivary secretion and swallowing:

The food bolus is propelled down the oesophagus by segmentation movements.

The pH of saliva rises as its rate of secretion increases.

Swallowing is a purely voluntary activity.

Both hormones and nerves play a role in the regulation of salivary secretion

. Regarding the control of gastric secretion:

Gastric acid is secreted by the parietal cells of the gastric glands in response to hormonal stimulation.

Most of the secretion of acid and pepsinogen occurs during the intestinal phase.

Gastric secretion does not begin until food enters the stomach.

Secretin secreted by the duodenum stimulates gastric secretion.

. Parietal cells of the gastric glands secrete intrinsic factor

True

False

. Intrinsic factor is required for the intestinal absorption of vitamin D in the upper ileum

True

False

. Regarding gastric motility:

Gastric emptying is inhibited by the enterogastric reflex.

The antral region of the stomach is important for the storage of food.

Contractions of the stomach wall do not begin until food enters the stomach.

The contractions of the stomach depend on activity in the vagus nerve.

. Regarding pancreatic secretion:

Pancreatic secretion is inhibited by gastrin secreted by the G cells of the antrum

Pancreatic acinar cells contain trypsin.

Cholecystokinin inhibits secretion from the exocrine pancreas.

The introduction of acid into the duodenum stimulates pancreatic secretion.

. Regarding digestion and absorption by the small intestine: Please select all that apply

Intestinal digestive enzymes are secreted by cells of the crypts of Lieberkuhn.

The small intestine absorbs all of the digestion products from dietary carbohydrates.

Small peptides are absorbed in the small intestine

The liver is the first organ to receive the digestion products of dietary fats.

. Which of the following statements regarding gastro-intestinal function are correct? Please select all that apply

The presence of large amounts of fat in the chyme will slow the rate of gastric emptying.

Distension of the ileum stimulates gastric motility.

Total gastrectomy leads to malabsorption of vitamin B12.

Aldosterone inhibits the absorption of sodium and water by the large intestine.

. A 35 year old man has been diagnosed with Crohn's disease and it is decided that it is necessary to remove the terminal ileum. Which of the listed items is he likely to need as a dietary supplement?

Vitamin B₂

Vitamin B₁₂

Vitamin D

Intrinsic factor

Self-test questions: Chapter 44

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