ACCESSORY ORGANS FOR DIGESTION LIVER GALL BLADDER PANCREAS (EXOCRINE, ENDOCRINE) · 2020-05-04 ·...
Transcript of ACCESSORY ORGANS FOR DIGESTION LIVER GALL BLADDER PANCREAS (EXOCRINE, ENDOCRINE) · 2020-05-04 ·...
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ACCESSORY ORGANS FOR DIGESTION
LIVER
GALL BLADDER
PANCREAS (EXOCRINE, ENDOCRINE)
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VERTEBRATE LIVER
- liver is largest internal organ
- hepatocytes function similarly in all vertebrates
- lobulated in birds, mammals,
no lobules in fish, amphibians or reptiles
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LIVER
functions:
-process nutrients from intestine - CHO, AA
-break down toxins, wastes in blood → bile (exocrine)
-synthesize plasma proteins (endocrine)
blood supply
lobule structure
hepatocytes
bile production
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STOMACH
SMALL INTESTINE
SPLEEN
VENOUS DRAINAGE
HEPATIC
PORTAL VEIN
HEPATIC
ARTERY
PORTAL VENULES IN
HEPATIC LOBULE
SINUSOIDS
BETWEEN HEPATOCYTES
CENTRAL VEIN HEPATIC VEIN INFERIOR
VENA CAVA
LIVER: two blood circulations
PORTAL SUPPLY
SYSTEMIC SUPPLY
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LIVER LOBULE ANATOMY H69
central vein
portal triads
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PORTAL TRIAD H69
branch of
hepatic
portal vein bile
duct
arteriole
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sinusoids
central
vein
CENTRAL VEIN DRAINS LIVER SINUSOIDS H69
hepatocyte
sheets
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BILE: made in liver, stored in gall bladder
aqueous salt solution containing:
bile acids, bile salts:
- help emulsify fats in small intestine
- promote lipase action and lipid absorption
bilirubin:
- spleen macrophages phagocytose old erythrocytes,
produce bilirubin → plasma → hepatocytes absorb,
secrete into bile
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bile ductule collects bile from local canaliculi H69
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ELASMOBRANCH LIVER - no lobules CVH 73
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SQUALENE (lipid) IN ELASMOBRANCH HEPATOCYTES CVH73
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TELEOST LIVER CVH146
bile ductule arteriole
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sinusoids bile duct
TOAD LIVER CVH166
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ALLIGATOR LIVER CVH171 bile ductule
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HUMAN GALL BLADDER CROSS-SECTION H211
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adventitia
muscularis
lamina
propria
epithelium
GALL BLADDER WALL H211
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GALL BLADDER EPITHELIUM AND LAMINA PROPRIA H211
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CODFISH GALL BLADDER CVH154
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epithelium
muscularis
adventitia
CODFISH GALL BLADDER WALL CVH154
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PANCREAS: MIXED EXOCRINE AND ENDOCRINE
-acinar glands: exocrine
- pancreatic juice - digestive enzymes
via pancreatic duct → duodenum
-pancreatic islets (islets of Langerhans): endocrine
-hormones
insulin - β cells
glucagon - α cells
peptide hormones
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HUMAN PANCREAS H144
islet acinar region
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PANCREATIC
DUCT AND
DUCTULE
H144
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ALLIGATOR PANCREATIC ACINI AND DUCTULE CVH170
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HUMAN ISLETS OF LANGERHANS CVH144
- endocrine secretion
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ISLETS OF LANGERHANS IN ELASMOBRANCH PANCREAS
CVH69
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CVH69