40 Questions
What is the primary function of the muscularis mucosae?
To facilitate local movements of the mucosa
Which part of the alimentary canal is involved in ingestion?
Oral cavity or buccal cavity
What is the function of the serosa in the GI tract?
To protect the GI tract
What is the function of the epithelium of the gum and hard palate?
To protect against abrasion
What is the function of the defensins released by the oral cavity?
To protect against infectious disease
What is the function of the lips in the oral cavity?
To protect the anterior opening
What is the function of the muscularis externa in the GI tract?
To facilitate segmentation and peristalsis
What is the function of the submucosa in the GI tract?
To enable the stomach to regain its shape
In which region of the abdomen does the cecum lie?
Right iliac fossa
What is the main function of the large intestine in terms of digestion?
Absorption of water and electrolytes
What is the characteristic of the mucosa in the large intestine?
It has a large number of goblet cells
Which muscle layer is incomplete in the large intestine?
Longitudinal muscle layer
What is the function of the internal anal sphincter?
Involuntary control of anal canal
What is the characteristic of the anal canal?
It is the last 2 to 3 cm of the digestive tract
How many major lobes does the liver have?
Two
What is the characteristic of the external anal sphincter?
It is composed of skeletal muscle
What is the function of the teniae coli in the large intestine?
To create pocket-like sacs called haustra
What is unique about the mucosa of the large intestine compared to the small intestine?
It lacks villi and enzymes
What is the role of the vermiform appendix?
To play a role in body immunity and host enteric bacteria
What is the function of the rectal valves?
To prevent gas from being passed with feces
What do enteric bacteria in the large intestine synthesize?
B complex vitamins and most of vitamin K
What stimulates mucus secretion in the large intestine?
Tactile stimulation of the mucous cells
What is the function of mucus in the large intestine?
To protect the wall against excoriation and bacterial activity
Why is the colon not essential for life?
Because no food breakdown occurs except for that done by enteric bacteria
What is the primary mechanism by which the stomach empties its contents into the duodenum?
Each strong antral peristaltic wave forcing several milliliters of chyme into the duodenum
What is the main function of enterogastric nervous reflexes from the duodenum?
To inhibit antral propulsive contractions and increase the tone of the pyloric sphincter
What is the primary factor that initiates enterogastric nervous reflexes from the duodenum?
The degree of distention of the duodenum
How do fats in the duodenum affect gastric emptying?
They inhibit the activity of the pyloric pump and increase the tone of the pyloric sphincter
What is the approximate length of the small intestine in a living body?
2-4 meters
What type of movement in the small intestine is responsible for propelling chyme towards the large intestine?
Propulsive contractions
What is the primary function of vitamin B12 in the body?
Maturation of RBCs
What is the primary mechanism by which the stomach regulates the amount of chyme it empties into the duodenum?
Enterogastric nervous reflexes from the duodenum
Which nerve type stimulates the secretory activity of the stomach?
Parasympathetic nerves
What is the effect of increased food volume in the stomach on stomach emptying?
It increases stomach emptying by stretching of the stomach wall and inducing nervous reflexes
What is the role of gastrin in the stomach?
Stimulation of HCl and enzyme secretion
Which of the following is NOT a stimulator of parietal cells?
Insulin
What is the effect of antihistamines on HCl secretion?
Decrease HCl secretion
What is the mechanism of HCl formation in the stomach?
Active secretion of H+ in exchange with K+ and Na+
What is the primary stimulus for pepsinogen secretion?
Acetylcholine release
What is the role of bicarbonate in the stomach?
Neutralization of acid in the stomach
This quiz covers the layers of the gastrointestinal tract, including the mucosa, submucosa, muscularis externa, and serosa, and their respective functions and tissue types.
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