Download Class Topics

5/23/2017
Title:
Anat & Phys
3/13/07
Objectives:
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Class Topics
• Notes
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Liver
Hepatocytes
Gallbladder
Hormones
Nutrient Absorption
"No one can make you feel inferior without your consent."
Eleanor Roosevelt
Tuesday, May 23, 2017 8:51 AM
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Class Assignments
What
By When
• Comparative anatomy essay – cellulose digestion 3/13/07
• Due this class period
• Due next class period
• Due in the future
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Liver
• Largest visceral organ
• divided into two lobes
– each lobe contains 100,000 hepatocytes
• Hepatocyte functions
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clean blood
store iron and other heavy metals
forms bile - sent to gallbladder
drug inactivation
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From: http://faculty.southwest.tn.edu/rburkett/A&P2%20Digestive%20System%20Lab.htm
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Digestive function of Hepatocytes
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Carbohydrate metabolism
Lipid metabolism
amino acid metabolism
vitamin storage
– fat soluble vitamins
• A,E,D,K, B12
• Acquire nutrients directly from small
intestine via hepatic portal vein
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Gallbladder
• Releases bile through common bile
duct
– guarded at the duodenum by sphincter of
Oddi
• Bile function
– Break open lipids to lipase can digest
• Bile salts are recycled by ileum
• Gallstone - bile salt precipitates block common bile duct
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Hormones
• Gastrin
– Released by stomach
– causes release of gastric juices and
increases motility
– released at sight, smell, or ingestion of
food
• Secretin
– stimulates the release of buffers and
water released into duodenum
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Hormones
• Cholecystokinen (CCK)
– secreted when chyme hits duodenum
– Releases sphincter of Oddi
– Stimulates the production of pancreatic
juices
– inhibits gastric activity
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Nutrient absorption
• Carbohydrates (monosaccharides)
– through microvilli to blood stream
– facilitated diffusion
• Proteins (amino acids)
– through microvilli to blood stream
– facilitated diffusion
• Lipids (triglycerides)
– through microvilli to lymph
– diffusion - nonpolar substances
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From: http://www.agen.ufl.edu/~chyn/age2062/lect/lect_20/digproc.gif
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Lab
• Lower Digestive Tract
• Complete through #6
– If time allows
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