Digestive Structures
Goals the Section...
• Analyse how the structures of the
digestive system work together
• Describe the components, pH, and
digestive actions of salivary, gastric,
pancreatic, and intestinal juices
DIGESTIVE STRUCTURES
The 7m tube running from
mouth to anus.
Location of food entrance,
nutrient absorption
and waste excretion.
The Digestive System
• Lets start with the accessory organs
Liver
Pancreas
Accessory Organs
• In fashion, is your outfit complete
without accessories?
• What does this term mean in the
digestive system?
• Answer: part of the digestive system
but no food ever enter these structures
• Pancreas, Liver and ...?
• Answer: salivary glands
Liver
and
Pancreas
http://www.uptodate.com/online/content/images/gast_pix/Pancreas_
anatomy.jpg
Pancreas
• Posterior to stomach
• Endocrine and Exocrine gland
• Produces Pancreatic Juice, Insulin and
Glucagon
• Your Mission:
– Create a chart with the heading Pancreatic
Juice, Insulin, and Glucagon
– Describe in your chart what each does, what
cells in the pancreas make each and
whether it is endocrine or exocrine substance
Pancreas - Exocrine
• Produces digestive juices called
PANCREATIC JUICE
– Made in zymogen cells which are
connected to the pancreatic duct
– Contains: Water, Sodium Bicarbonate,
Lipase, Trypsinogen, Nucleases and
Pancreatic Amylase
Pancreas - Endocrine
• Produces INSULIN and GLUCAGON in
cells called islets of Langerhans
– Hormones that regulate body’s use of
glucose
– Insulin – regulates cell’s ability to use
glucose (along with the liver’s storage of
glucose as glycogen)
– Glucagon – allows liver to release glucose
when blood levels drop
Liver
•
•
•
•
•
Posterior to the diaphragm
Large
Generous blood supply
6 very important functions
Your Mission:
– List the 6 functions of the liver
Functions of the Liver
Regulate glucose levels in the blood
Produce urea
Detoxify blood
Produce Bile
Produce different globulins (blood proteins)
Break down old blood cells
To Summarize Thus Far...
• Enzymes play a crucial role in the
digestion of food into absorbable unit
molecules
• Two accessory organs, the liver and
pancreas, are provide life sustaining
functions although they never directly
process food
• Next stop... The digestive tract!
http://road-to-health.com/wordpress/wp-content/themes/thesis15/rotator/digestion.jpg