24 Questions
What is the primary function of the lamina propria layer in the mucosa?
To provide vascularisation and lymphoid drainage to the epithelium
Which layer of the mucosa is responsible for local peristalsis and catastalsis of the tract?
Muscularis mucosae
What type of muscle is found in the muscularis externa?
Smooth muscle
What is the function of the submucosa?
To anchor the mucosa to the muscularis externa
Which layer of the mucosa contains mucous-secreting glands?
Submucosa
What is the primary function of the digestive system?
To transport and digest ingested food and absorb nutrients
What is the inner layer of the muscularis externa composed of?
Circularly oriented smooth muscle
Which of the following organs is NOT part of the gastrointestinal tract?
Salivary glands
What is unique about the muscularis externa in the stomach?
It has a third obliquely arranged layer of smooth muscle
What is the outermost layer of the gastrointestinal tract?
Serosa (or Adventitia)
What is the primary function of the epithelium?
To absorb and secrete nutrients and substances
What is the primary function of the mucosa in the gastrointestinal tract?
To secrete digestive enzymes and mucin
What is the purpose of the lymphatic tissue in the mucosa?
To provide immunologic protection
What is the name of the layer of smooth muscle cells in the stomach?
Oblique layer
What is the name of the tube that extends from the esophagus to the anal canal?
Gastrointestinal tract
What is the name of the partially digested food in the gastrointestinal tract?
Chyme
What is the function of the contraction of the smooth muscle layer in the gastrointestinal tract?
To cause peristalsis
Why is the smooth muscle layer thicker in the large intestine?
Because it requires more force to propel faecal matter
What is the function of the pyloric sphincter?
To allow for the controlled release of chyme into the small intestine
What is the main difference between serosa and adventitia?
Serosa covers intraperitoneal structures, while adventitia covers retroperitoneal structures
What is the approximate length of the esophagus?
25 cm
What is the characteristic of the lumen of the esophagus when a bolus of food passes through it?
It expands without mucosal injury
What is the function of the longitudinal folds in the esophagus?
To allow for the expansion of the lumen when food passes through
What is the characteristic of the esophagus as it enters the abdominal cavity?
It is free for a short distance
Introduction to the digestive system, covering its components, functions, and processes. This quiz focuses on the esophagus and stomach, ideal for 2nd-class dentistry students.
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