Notes

1
Class Topics
Title Anat Phys 3/13/07
Objectives

• .

• Notes
• Liver
• Hepatocytes
• Gallbladder
• Hormones
• Nutrient Absorption
• "No one can make you feel inferior without your
  consent."
• Eleanor Roosevelt

Friday, January 22, 2016 417 AM
2
Class Assignments
By When
What

• 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
• clean blood
• store iron and other heavy metals
• forms bile - sent to gallbladder
• drug inactivation

4
From http//faculty.southwest.tn.edu/rburkett/AP
220Digestive20System20Lab.htm
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Digestive function of Hepatocytes

• 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/l
ect_20/digproc.gif
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Lab

• Lower Digestive Tract
• Complete through 6
• If time allows