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The Alimentary Canal and
Cellulose
By Aida Rogonich and Takara Reed
[Didas & TK]
Alimentary Canal/ Digestive Canal
• Mouth
• Pharynx
• Esophagus
• Stomach
• Small & Large Intestines
Mouth
• Food is taken in
• Grinded by teeth
• Mixed with saliva
– Comes from 3 large glands
• Parotid
• Submaxillary
• Sublingual
Pharynx
• Food passes through the pharynx
• Like a muscular membrane behind the nose
and mouth which helps process food
• Muscle contractions occur
• Food is pushed down into/through the
esophagus
Stomach
• After food passes through the esophagus by
mucus and muscle contractions it enters the
stomach
– cardiac orfice
• Strong gastric juices mix with the mucus and
muscle contractions help fully digest and
dissolve food
– 2-4 hours
Intestines
• From stomach the food is further digested
here and then goes through to the
duodenum
• Then fluids flow through the pancreatic duct
– Urination
• And solids flow through the bile duct
– Wastes
Miscellaneous
• 30 feet long in humans
• Imagine that you put one end of a hose in
your mouth and kept threading it through
until it came out of your butt. That's more or
less what the alimentary canal is
Reasons For Cellulose not being
digested
• Humans/ mammals don’t
contain the symbiotic
anaerobia bacteria needed
to produce enzymes to
breakdown the cellulose
• Cellulose binds so strongly
to each other. This makes
cellulolysis relatively
difficult compared to the
breakdown of other
polysaccharides
• Cellulose main use is as
dietary fiber or “roughage”
Continued
• We eat some plants and the cellulose we
take in is used to clear up our intestine; push
out wastes
• It contains no essential proteins or such
necessary, like other sugars
• It’s bonds cannot be broken down by the
fluids and muscle contractions part of the
canal