3U0 accessory digestive organs - myclass.peelschools.org

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					    ACCESSORY DIGESTIVE GLANDS

Pancreas
Liver
Gallbladder
          PANCREAS
1) EXOCRINE PORTION

-   synthesizes and secretes
    enzymes via a system of
    ducts that are essential for
    digestion in the intestine
•trypsinogen, amylase, lipase

Once acid touches S.Intestine the
hormone secretin is released to
communicate the neutralization of chyme

• Doudenal wall Secretes Larges Amounts of Bicarbonate:
  pancreatic enzymes work best at pH of 7-8
         PANCREAS
ENDOCRINE PORTION

-Synthesizes and secretes hormones into
 the bloodstream to regulate glucose,
 lipid, and protein metabolism

ISLETS OF LANGERHANS
  Known as the insulin-producing
 tissue, the islets of Langerhans do
 more than that. They are groups of
 specialized cells in the pancreas
 that make and secrete hormones.
 Named after the German pathologist
 Paul Langerhans (1847-1888),
         ENDOCRINE PORTION

CELL TYPES:

1) ALPHA CELLS (20%)

 - SECRETE GLUCAGON;
   RAISES BLOOD GLUCOSE LEVELS

 2) BETA CELLS (75%)

 - SECRETE INSULIN;
   LOWERS BLOOD GLUCOSE LEVELS


 3) DELTA CELLS (5%)
 - SECRETE SOMATOSTATIN;
  INHIBITS GLUCAGON AND INSULIN
  SECRETION
Homeostasis of Blood sugar (negative feedback Loop)




                 Normal range: 4-
                 6 mmol/L
         LIVER

1) EXOCRINE PORTION

  - synthesizesand secretes
  bile via a system of ducts
  that is essential for
  digestion in the intestine
2) ENDOCRINE PORTION
  - synthesizes and secretes numerous
   plasma proteins into the
   bloodstream:
   (albumin, fibrinogen, prothrombin,
   lipoproteins, etc.)
          LIVER


3-D LOOK AT THE
BILIARY SYSTEM
Apart from aiding in digestion the
liver breaks down and removes
harmful chemicals and drugs. It
changes nutrients into energy and
also produces proteins responsible
for blood clotting and balancing
body fluids.
       GALLBLADDER
    - LOCATION FOR
      CONCENTRATION AND
      STORAGE OF BILE


ROUTE OF BILE
  HEPATOCYTE

      BILE CANALICULI

               RT & LT HEPATIC DUCTS

                    COMMON BILE DUCT


      FILLING OF GALLBLADDER

  Bile emulsifies fats into
  smaller globules

				
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posted:4/14/2011
language:English
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