18 Questions
What is the primary mechanism by which the rate of mucus secretion in the large intestine is regulated?
Direct, tactile stimulation of the epithelial cells
What is the function of mucus in the large intestine?
It protects the intestinal wall and holds fecal matter together
What type of innervation can cause a marked increase in mucus secretion in the large intestine?
Parasympathetic innervation
What is the effect of extreme parasympathetic stimulation on the large intestine?
It causes a marked increase in mucus secretion and motility
What is the location of the mucous cells in the large intestine?
In the crypts of Lieberkühn
What is the effect of increased mucus secretion on the large intestine?
It increases peristaltic motility
What stimulates the secretion of Brunner's glands?
Gastrointestinal hormones, especially secretin
What is the primary function of the mucus secreted by Brunner's glands?
To protect the duodenal wall from digestion by acidic gastric juice
What type of stimulation inhibits the secretion of Brunner's glands?
Sympathetic stimulation
What is the function of the bicarbonate ions in the mucus secreted by Brunner's glands?
To neutralize the hydrochloric acid entering the duodenum from the stomach
Where are the crypts of Lieberkühn located?
Between the intestinal villi
What is the relationship between the parasympathetic nervous system and the secretion of Brunner's glands?
The parasympathetic nervous system stimulates the secretion of Brunner's glands
What is the primary function of the small intestine?
To absorb nutrients and their digestive products into the blood
What is the main role of goblet cells in the intestinal epithelium?
To produce mucus that lubricates and protects the intestinal surfaces
What is the pH of the intestinal secretions produced by the enterocytes?
Slightly alkaline, ranging from 7.5 to 8.0
What is the mechanism by which water is moved into the intestinal secretions?
Osmotic movement of water due to the secretion of ions
What is the daily rate of intestinal secretions produced by the enterocytes?
1800 ml/day
What is the role of the villi in the small intestine?
To absorb nutrients and their digestive products from the intestinal secretions
Learn about the unique features of mucous secretion in the large intestine, including the role of epithelial cells and the regulation of mucus secretion. Understand how the large intestine differs from the small intestine in terms of digestive enzymes and mucous secretion. Take this quiz to test your knowledge of the large intestine's mucous secretion process.
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