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MODULE 3 - Gastrointestinal System > PHYSIOLOGY - The Gastrointestinal System > Flashcards

PHYSIOLOGY - The Gastrointestinal System Flashcards

1
Q

What is mastication?

A

Mastication is the mechanical processing of food that is mixed with saliva to form a bolus for deglutition

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2
Q

What is the digestive enzyme found in saliva?

A

Lingual/salivary amylase

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3
Q

What type of gland is the parotid salivary gland?

A

The parotid salivary gland is a serous gland

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4
Q

What type of gland is the mandibular salivary gland?

A

The mandibular salivary gland is a merocrine gland

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5
Q

What type of gland is the sublingual salivary gland?

A

The sublingual salivary gland is a merocrine gland

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6
Q

What are acini?

A

Acini are the small sacs present at the end of salivary ducts

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7
Q

Which hormone stimulates saliva production?

A

Aldosterone

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8
Q

What are the three phases of deglutition?

A

Oral phase
Pharyngeal phase
Oesophageal phase

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9
Q

Which phase of deglutition is a voluntary phase?

A

Oral phase of deglutition

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10
Q

Which phases of deglutition are involuntary?

A

Pharyngeal phase
Oesophageal phase

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11
Q

Describe the oral phase of deglutition

A

During the oral phase of deglutition, the tongue moves the bolus caudally towards the oropharynx

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12
Q

Describe the pharyngeal phase of deglutition

A

During the pharyngeal phase of deglutition, the bolus stimulates pressure-sensitive sensory cells at the palatopharyngeal arches which stimulate a reflex to relax the cricopharyngeal muscle (upper oesophageal sphincter) and simultaneously contracts the pharyngeal muscles to push the bolus down towards the oesophagus, and moves the hyoid apparatus rostrally to hold the epiglottis over the larynx

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13
Q

Describe the oesophageal phase of deglutition

A

During the oesophageal phase of deglutition, peristaltic contractions of the oesophagus move the bolus towards the cardiac sphincter

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14
Q

What are the four functions of the stomach?

A

Food storage
Mechanical breakdown of food
Chemical breakdown of food
Secretion of intrinsic factors involved in Vitamin B12 absorption

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15
Q

What are the three different actions of gastric motility?

A

Propulsion
Grinding
Retropulsion

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16
Q

Describe propulsion in regards to gastric motility

A

Propulsion is the movement of the bolus from the fundus towards the pylorus via peristaltic contractions

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17
Q

Describe grinding is regards to gastric motility

A

Grinding is the peristaltic contractions that mix the bolus with the gastric juices to form chyme

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18
Q

Describe retropulsion in regards to gastric motility

A

Retropulsion is the action of the pylorus which delivers small quantities of chyme into the duodenum while simultaneously moving most of the chyme back into the stomach

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19
Q

What are the four types of cells found in the stomach mucosa?

A

Mucin-producing cells
Parietal cells
Chief cells
Neuroendocrine cells

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20
Q

What are the two types of neuroendocrine cells found in the stomach mucosa?

A

G-cells
Enterochromaffin-like cells

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21
Q

What is the function of mucin-producing cells?

A

Mucin-producing cells produce mucin which makes up mucus

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22
Q

What is the function of the mucus layer in the stomach?

A

The mucus layer of the stomach protects the stomach lining from the acidity of the gastric juices

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23
Q

What are the functions of parietal cells?

A

Parietal cells produce HCL and intrinsic factors for vitamin B12 absorption

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24
Q

What is the function of chief cells?

A

Chief cells produce pepsinogen (inactive form of pepsin)

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25
What is the function of G-cells?
G-cells produce gastrin hormone
26
What are the three functions of the gastrin hormone?
Gastrin stimulates HCl secretion from the parietal cells Gastrin stimulates pepsinogen secretion from the chief cells Gastrin stimulates pancreatic juice secretion
27
What stimulates gastrin secretion from the G-cells?
Distension of the stomach stimulates Gastrin secretion from the G-cells
28
What is the function of Enterochromaffin-like cells?
Enterochromaffin-like cells produce histamine
29
Which cells are found within the cardiac mucosa?
Mucin-producing cells
30
Which cells are found within the fundus and corpus mucosa?
Mucin-producing cells Parietal cells Chief cells
31
Which cells are found within the pyloric mucosa?
Neuroendocrine cells (G-cells and Enterochromaffin-like cells)
32
What is auto-catalysis?
Auto-catalysis is the activation of pepsinogen into pepsin by the presence of HCL or pepsin itself
33
Describe the process of HCL production in parietal cells
1. Carbonic anhydrase within the parietal cells catalyses the production of carbonic anhydrase from CO2 and H2O 2. Carbonic acid readily dissociates into HCO3- and H+ 3. H+ exits the cell into the gastric lumen in exchange for K+ 4. HCO3- exits the cell into the gastric lumen in exchange for Cl- 5. Cl- exits the cell into the gastric lumen and H+ and Cl- react to form HCL
34
What are the three factors that regulate HCL production in the parietal cells?
Acetylcholine Gastrin Histamine
35
What is cephalic digestion?
Cephalic digestion is when the sight, smell or taste of food triggers the vagus nerve to stimulate HCL production from the parietal cells in anticipation of digestion
36
How is gastric emptying stimulated?
NEURAL: - long reflexes via the vagus nerve and short reflexes via the stomach wall which stimulate acetylcholine release, initiating smooth muscle contraction of the stomach ENDOCRINE: - gastrin hormone stimulates gastric contractions which relax the pyloric sphincter
37
Which cells regulate gastric emptying?
Interstitial cells of Cajal
38
How do the interstitial cells of Cajal regulate gastric emptying?
The interstitial cells of Cajal produce spontaneous oscillations within the smooth muscle of the stomach and the small intestine, synchronising the smooth muscle activity and this the rate of gastric emptying with the absorption capacity of the small intestine. Neural, hormonal or mechanical input can bring these oscillations up to threshold value, triggering an action potential, smooth muscle contraction and gastric emptying
39
What has the greatest impact on the rate of gastric emptying?
The conditions within the duodenum have the greatest impact on the rate of gastric emptying
40
What is the main function of the pancreas within the digestive system?
Exocrine secretions of pancreatic juices
41
What are the two pancreatic ducts and where do they run into the duodenum?
Pancreatic duct joins with the common bile duct and empties into the major duodenal papilla Accessory pancreatic duct empties into the minor duodenal papilla
42
What are the two cell types involved in pancreatic juice secretion?
Pancreatic intercalated duct cells Acinar cells
43
What is produced and secreted by pancreatic intercalated duct cells?
Pancreatic intercalated duct cells produce and secrete bicarbonate
44
What is produced and secreted by acinar cells?
Acinar cells produce and secrete pancreatic enzymes
45
What is the function of the hormone secretin in pancreatic function?
Secretin is produced by the duodenum in response to acidic chyme to stimulate bicarbonate secretion from the pancreatic intercalated cells
46
What is the function of the hormone cholecystokinin (CCK) in pancreatic function?
Cholecystokinin (CCK) is produced by the duodenum is response to increased lipid concentrations to stimulate the secretion of pancreatic enzymes from the acinar cells of the pancreas
47
What are the three phases of pancreatic juice secretion?
Cephalic phase Gastric phase Intestinal phase
48
Describe the cephalic phase of pancreatic juice secretion
The sight, smell or taste of food triggers the vagus nerve to stimulate gastrin production which stimulates pancreatic juice secretion in anticipation of digestion
49
Describe the gastric phase of pancreatic juice secretion
Bolus distends the stomach stimulating a reflex which triggers further pancreatic juice secretion
50
Describe the intestinal phase of pancreatic juice secretion
Acidic chyme enters the duodenum stimulating secretin to stimulate further secretion from the pancreatic intercalated duct cells and increased lipid concentration stimulates cholecystokinin (CCK) which stimulates further secretion from the acinar cells
51
What are the two main functions of the liver within the digestive system?
Bile synthesis and secretion Regulation of nutrient absorption into the systemic circulation
52
What is the function of bile salts (the primary component of bile)?
Bile salts are involved in the emulsification of lipids
53
What is the role of secretin in liver function?
Secretin is produced by the duodenum is response to acidic chyme and stimulates bile production in the hepatocytes
54
What is the role of cholecystokinin (CCK) in liver function?
Cholecystokinin (CCK) is produced by the duodenum in response to increased lipid concentration in the duodenum and stimulates the contraction of the gallbladder to allow for stored bile secretion
55
What is the main function of the small intestine?
The small intestine is the main site of nutrient degradation and absorption
56
Which macromolecule is exclusively absorbed by the small intestine?
Lipids are exclusively absorbed by the small intestine
57
What are the three different actions of small intestinal motility?
Segmentation Peristalsis Migrating mobility complex
58
Describe segmentation in regards to small intestinal motility
Segmentation is the action of circular muscle within the muscularis externa which contracts to segment the chyme within the small intestine, moving it backwards and forwards
59
Describe the migrating mobility complex in regards to small intestinal motility
When the nutrients are absorbed within the small intestine, segmentation stops and the migrating mobility complex contractions clear the indigestible residue from from the small intestine into the large intestine
60
What are the cells which regulate small intestinal motility?
Interstitial cells of Cajal
61
What are the two cells involved in small intestinal secretions?
Paneth cells Goblet cells
62
What is produced and secreted by paneth cells in the small intestine?
Paneth cells produce and secrete antimicrobial peptides
63
What is produced and secreted by goblet cells in the small intestine?
Goblet cells produce and secrete mucus
64
Where are goblet cells and paneth cells found within the small intestine?
The crypts of Leiberkuhn
65
What is the function of the Brunner's glands in the small intestinal muscosa and submucosa?
Brunner's glands produce of an alkaline mucous secretion to neutralise the acidic chyme exiting the stomach through the and so preventing acidic damage to the mucosa of the small intestine
66
Describe the process of small intestinal emptying
When indigestible residue reaches the ileocolic orifice, the orifice is relaxed by the pressure of the residue. When this residue enters the colon, the colon is distended which closes the ileocolic orifice
67
What are the two main functions of the large intestine?
Absorption of water and ions from indigestible residue Microbial digestion of any remaining carbohydrates or proteins
68
What are the four different actions of large intestinal motility?
Segmentation Peristalsis Retroperistalsis Mass movements
69
What is the purpose of retroperistaltic contractions of the large intestine?
Retroperistaltic contractions of the large intestine ensure that all of the nutrients are absorbed from the ingest before defecation occurs
70
What are mass movements of the large intestine?
Mass movements are contractions of the terminal colon and the rectum resulting in defecation

MODULE 3 - Gastrointestinal System (17 decks)

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