25 Questions
What is the principal physiologic action of gastrin on the stomach?
Stimulation of gastric acid secretion
What is another name for the action of gastrin on the mucosa of the stomach and intestines?
Trophic action
What is the effect of gastrin on pepsin secretion?
Stimulation of pepsin secretion
What is the main component of bile that plays a crucial role in digestion?
Bile acids
Which of the following organs is NOT affected by gastrin?
Pancreas
What is the effect of sympathetic input on the composition of saliva?
It increases proteinaceous content
What is the primary function of bile in the digestive system?
To facilitate fat digestion
What is the term for the cycle of bile secretion and reabsorption in the body?
Enterohepatic circulation
How does sympathetic input influence the volume of saliva?
It has little influence on the volume
What is the overall effect of gastrin on the digestive system?
Stimulation of digestive enzyme secretion and gut growth
What happens to the proteinaceous content of saliva when sympathetic input is stimulated?
It increases
What is the primary organ responsible for producing bile?
Liver
What is the term for the pigments produced during the breakdown of bilirubin?
Biliverdin
What is the primary effect of sympathetic input on saliva?
Altering the composition of saliva
Which of the following is true about sympathetic input and saliva?
It increases proteinaceous content but has little influence on volume
What helps regulate the secretion of pancreatic juice?
Hormonal system
What is the purpose of the trypsin inhibitor secreted by the pancreas?
To prevent self-digestion
What is the primary function of the pancreatic juice?
To break down food into smaller molecules
What is the relationship between the pancreas and trypsin?
The pancreas inhibits trypsin
What is the significance of the pancreas secreting a trypsin inhibitor?
It prevents the pancreas from digesting itself
Where are the S cells located that secrete Secretin?
In the glands of the mucosa of the upper portion of the small intestine
What is the function of Secretin in the body?
To stimulate the release of digestive enzymes from the pancreas
What type of cells secrete Secretin?
S cells
Where is Secretin released from?
The small intestine
What is the role of Secretin in the digestive process?
To stimulate the release of digestive enzymes from the pancreas and bile from the liver
Study Notes
Sympathetic Input and Saliva
- Sympathetic input slightly modifies the composition of saliva, particularly by increasing proteinaceous content.
- Sympathetic input has little influence on saliva volume.
Pancreatic Juice Secretion
- Pancreatic juice secretion is primarily under hormonal control.
- The pancreas normally secretes a trypsin inhibitor.
Bile and Digestion
- Bile acids represent the most important components of bile as a digestive secretion.
- Bile contains bilirubin, biliverdin, and other components.
Gastrin
- Gastrin has various actions, including:
- Stimulation of gastric acid and pepsin secretion.
- Stimulation of the growth of the mucosa of the stomach and small and large intestines (trophic action).
Secretin
- Secretin is secreted by S cells located deep in the glands of the mucosa of the upper portion of the small intestine.
- Secretin stimulates the secretion of pancreatic juice.
Learn about the role of sympathetic input on salivary glands, including its effects on saliva composition and volume.
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