SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology [email protected]...
-
date post
20-Dec-2015 -
Category
Documents
-
view
218 -
download
1
Transcript of SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology [email protected]...
![Page 1: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/1.jpg)
SF Biology II 1
BIOLOGY IIBIOLOGY II
Gut Function & Regulation
Dr Alan Tuffery — [email protected]
PunctualityMobiles
![Page 2: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/2.jpg)
SF Biology II 2
Nutrition & ExcretionNutrition & Excretion
•Regulation of Motility & Secretion
•Digestion, Absorption & Defaecation
•Mammalian Kidney: Filtration, Reabsorption & Secretion; Regulation
![Page 3: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/3.jpg)
SF Biology II 3
Useful TextbooksUseful Textbooks
Germann & StanfieldPrinciples of Human Physiology(612 P23 Hamilton Reserve; S-LEN)
Sherwood Human Physiology From Cells to
Systems(612 M98*2Hamilton Reserve; S-LEN)
![Page 4: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/4.jpg)
SF Biology II 4
1. Overview of Gut1. Overview of Gut
General Function of GutGeneral structure assumed
Accessory organs: salivary glands, pancreas, liver
Motility
Secretion (e.g. pancreas)
![Page 5: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/5.jpg)
SF Biology II 5
Gut — General FunctionsGut — General Functions
• Motility• Secretion• Digestion• Absorption• (Immunological)
![Page 6: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/6.jpg)
SF Biology II 6
General structure of the gutGeneral structure of the gut
![Page 7: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/7.jpg)
SF Biology II 7
Liver lobuleLiver lobule
• Flow of nutrients– From hepatic portal
vein
• Hence gradient of stored nutrients from HPV to central vein
• ’bipolar’ hepatocytes
![Page 8: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/8.jpg)
SF Biology II 8
PancreasPancreas
• Endocrine– Insulin,glucagon
• Exocrine– Enzymes
(acini)
– Bicarbonate (ducts)
![Page 9: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/9.jpg)
SF Biology II 9
Motility — definedMotility — defined
• The movement of the wall of the gut*
– Peristalsis (rel. rare)– Segmentation (main)– Haustration (large intestine = segmentation)
• *NOT movement of the contents of the gut
![Page 10: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/10.jpg)
SF Biology II 10
Motility — segmentationMotility — segmentation
• Commonest• Alternating
contraction• Mixing
AND• Propulsion• Frequency
decreases distally
![Page 11: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/11.jpg)
SF Biology II 11
Motility — peristalsisMotility — peristalsis
• Relatively rare
• Waves of contraction
• Rapid propulsion– ‘clearing’
![Page 12: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/12.jpg)
SF Biology II 12
PancreasPancreas
• Endocrine– Insulin,glucagon
• Exocrine– Enzymes
(acini)
– Bicarbonate (ducts)
![Page 13: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/13.jpg)
SF Biology II 13
Pancreas — exocrine functionPancreas — exocrine function
• Stimulus: H+
• Signal: secretin
• Effector : pancreatic duct cells
• NEGATIVE FEEDBACK
![Page 14: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/14.jpg)
SF Biology II 14
Pancreas — Endocrine functionPancreas — Endocrine function
• Acts to prevent rise in glucose following digestion/absorption
![Page 15: SF Biology II1 BIOLOGY II Gut Function & Regulation Dr Alan Tuffery — Physiology atuffery@tcd.ie PunctualityMobiles.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d485503460f94a2401c/html5/thumbnails/15.jpg)
SF Biology II 15
Gut — Control mechanismsGut — Control mechanisms