Large Intestine Mucous Secretion Regulation

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What is the primary mechanism by which the rate of mucus secretion in the large intestine is regulated?

Hormonal stimulation from the pituitary gland

Sympathetic innervation from the spinal cord

Direct, tactile stimulation of the epithelial cells (correct)

Increased blood flow to the large intestine

What is the function of mucus in the large intestine?

It absorbs water and electrolytes

It protects the intestinal wall and holds fecal matter together (correct)

It facilitates the digestion of nutrients

It regulates the motility of the colon

What type of innervation can cause a marked increase in mucus secretion in the large intestine?

Parasympathetic innervation (correct)

Enteric innervation

Sympathetic innervation

Somatic innervation

What is the effect of extreme parasympathetic stimulation on the large intestine?

It causes a marked increase in mucus secretion and motility Signup and view all the answers

What is the location of the mucous cells in the large intestine?

In the crypts of Lieberkühn Signup and view all the answers

What is the effect of increased mucus secretion on the large intestine?

It increases peristaltic motility Signup and view all the answers

What stimulates the secretion of Brunner's glands?

Gastrointestinal hormones, especially secretin Signup and view all the answers

What is the primary function of the mucus secreted by Brunner's glands?

To protect the duodenal wall from digestion by acidic gastric juice Signup and view all the answers

What type of stimulation inhibits the secretion of Brunner's glands?

Sympathetic stimulation Signup and view all the answers

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 Signup and view all the answers

Where are the crypts of Lieberkühn located?

Between the intestinal villi Signup and view all the answers

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 Signup and view all the answers

What is the primary function of the small intestine?

To absorb nutrients and their digestive products into the blood Signup and view all the answers

What is the main role of goblet cells in the intestinal epithelium?

To produce mucus that lubricates and protects the intestinal surfaces Signup and view all the answers

What is the pH of the intestinal secretions produced by the enterocytes?

Slightly alkaline, ranging from 7.5 to 8.0 Signup and view all the answers

What is the mechanism by which water is moved into the intestinal secretions?

Osmotic movement of water due to the secretion of ions Signup and view all the answers

What is the daily rate of intestinal secretions produced by the enterocytes?

1800 ml/day Signup and view all the answers

What is the role of the villi in the small intestine?

To absorb nutrients and their digestive products from the intestinal secretions Signup and view all the answers

Large Intestine Mucous Secretion Regulation

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