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Digestive System – Anatomy & Physiology Summary Notes – Complete Breakdown of Digestion and Absorption Processes

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Description: This is the exact summary I used to achieve a High Distinction (96/100) in Anatomy and Physiology. These notes are carefully structured to simplify complex digestive processes into clear, logical, and exam-focused explanations that helped me master the content efficiently and score at a top level. This document provides a comprehensive overview of the digestive system, covering anatomical structure, histology, blood supply, motility, enzyme regulation, and nutrient absorption pathways. It explains the alimentary canal from mouth to anus, including the oral cavity, pharynx, oesophagus, stomach, small intestine, and large intestine, as well as accessory organs such as the liver, pancreas, and gallbladder. Key physiological processes such as ingestion, propulsion (peristalsis and segmentation), mechanical and chemical digestion, absorption, and defecation are clearly outlined step-by-step. The notes also detail bile production and recycling, gallbladder function, pancreatic enzyme activation, gastric secretion phases (cephalic, gastric, and intestinal), hormonal regulation (CCK, gastrin), hepatic portal circulation, liver metabolism and detoxification, lipid absorption via micelles and chylomicrons, and differences between intraperitoneal and retroperitoneal structures. High-yield clinical correlations are included, such as GERD, peptic ulcers, gallstones, jaundice, Crohn’s disease, cirrhosis, pancreatic insufficiency, lactose intolerance, and appendicitis. Content is organised using structured diagrams, labelled pathways, and comparison tables to maximise clarity and retention. Every section aligns with core Anatomy and Physiology learning outcomes and focuses on concepts commonly tested in exams, making it ideal for revision, midterms, and final exam preparation.

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Voorbeeld van de inhoud

, Greater mentum attaches from of stomach transverse color
greate curvature C

BILE & GALL BLADDER
:




Hangs over investines (protect 2 insulate
alkalize fluid produced
⑪ Bile :
yellow-green , by hepatocytes Lesser amentum : from liver > lesser curvature of stomach

Composition Bile sales
(emulsify far) Continuous with visceral peritoneum of stomach
Bile
pigmente (bilirubin) : breakdown of
haemoglobin . contains blood vessels Chepatic avery , portal vein
,
bile duct)
Phospholipids (lecithin) : assist fat
digestion
Triglycerides ⑪ Mesentery Double layer of visceral peritorium
Anchors investines to abdominal wall
Electrolytes posterior
Cholestere excreted bile blood vessels
- via Contains
lymphatics
, ,
nerves for investines

breaks down fat Structural 2 fat
Functions Emulsification : Bile salt
globules > small droplets for enzyme activation support storage

bilirubin from Meso colon Transverse mesocolon
Removes cholesterd
body (blood) transverse solan
posterior abdominal wall
+ : connects +



↓ break down Sigmoid mesucolan : connects
sigmoid colon +
posterior abdominal wall
strcobilin (brown faces) => if no bile
(grey-while faces(
Digestion aid (phospholipid-dile salt> assist fat
absorption small intestine)
&


in
MAJOR FUNCTION OF DIGESTIVE SYSTEM : 6 major steps
Bile
Recycling 4-K
times/day ① Ingestion : Process of
taking food into the mouth
blood
by ileum
-


reabsorbed into

Back to liver
by hepatic portal vein ② Propulsion : Foods more through the GI tract .




Swallwing voluntary :



Re-secreted of smoh muscle
into new bile Peristalsis
involuntary
: contraction

I move food towards
Flow obbile bile right-left hepatic
:
Hepatocytes > cannawli- -
> ducts
& Mechanical breakdown Tsurface
S
of food for to act
major
duodenal
papilla common bile ducts common
hepatic cluct merge area
enzyme .




<+ E




(duodenum) cystic duct (from gallbladder) Chewing-mixing foods segmentation (in small intestine)
+ Stomach
churning +



Gallbladder small muscular eac (v10am) under
right lobe of liver
Stores 2 concentrates excessive bile ⑪ Digestion Enzymes break
large molecules I small molecules Carb. > monosaccharides
contracts to secrete bile into cystic duct > bile duct > duodenum
Parkins > amino acids


Pathologies .
Fats ,
farryacids glyard +



①Gallstmes caused I cholesteral
by
or t bile salt s cholesterol crystalisation ⑤ Absorption Murrents more from lumen > mucosal alls
O bloodstream (most nusrnts)/ lymph lipid)
,




[ Obstructs bile flow >
pain during gallbladder contraction . ↓
Loa -
active/passive transport
② Jaundice
(vangdal blocked bile flow > bilirubin reabsorbed into blood lang ang que
Skin 2
eyes turn yellow
⑥ Defecation Elimination of
indigestible residues as faces
through the anus



OMENTA 2 MESENTERY

serous membrane :
lining in the abdominal
cavity 2 organs
LARGE INTESTINE extends from ileocecal value > anus


> Two continuous layers fanetal peritoneum-lines abdominal walls Frames the small intestine

Visceral peritoneum covers the organs Length : 1, 5 m (shorter but wider than small investines
Peritoneal between parietal 2 visceral peritoneum filled with serious
> Function Absorb water 2 electrolytes
cavity :
space ,

fluid for friction-free movement .


Bacterial fermentation (A) more explanation
Faces formation/Defecation
⑪ Omenta double layer of visceral peritoneum between Stomach 2 other
organs
Pathway for blood vessels , lymphatics ,
nerves Subdivisions ~




contains
fatty ligamentous
,
tissue ① Coecum Blindpouch below ilocal value ② Appendix Lymphoid tissue I stores
good bacteria
Protection for indestine 1st part of
-




large
investine Twisted structure > bacterial accumulation +

infend mutiplication
appendicitis c

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Aantal pagina's
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Geschreven in
2025/2026
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