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The Digestive System_

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					The Digestive System!



What's in your
 stomach?




By: Aleah Fisher & Brianna Hay
Standard 9f


Students Know the individual functions and
 sites of secretion of digestive enzymes
The Mouth

 The mouth is the first
  step to the digestive
  system
 The saliva in your mouth
  contains a digestive
  enzyme called amylase
 Amylase breaks down
  starches in your food
The Esophagus
 After you chew your food
  your tongue helps to push it
  to the back of your throat,
  and down your esophagus
 The esophagus is a muscular
  tube that connects your
  mouth to your stomach
 Your food moves down by
  your peristalsis,
 Peristalsis are a series of
  smooth muscle contractions
The Stomach




 Once your chewed up food reaches the end of your esophagus it enters the
  stomach
 Physical and chemical digestion take place (muscular churning and chemical
  digestion)
 There are three layers of muscles that lay on top of each other, that are
  located on the walls of your stomach.
 When these muscles contract they try to break down the swallowed food,
  this process being muscular churning.
 The chemical digestion begins next as the gastric juice located in the lining
  of the stomach, this contains pepsin which begins the digestion of food.
The Small Intestine
 After digested your food
  moves to the small intestine,
  a muscular tube about six
  inches long
 The digestion of food is
  completed here by further
  muscle contractions, at the
  same time carbohydrates
  and protein under go more
  chemical digestion with the
  help of produced enzymes
  secreted by the pancreas
The pancreas
 The pancreas is a soft,
  flattened gland the secret
  digestive enzymes as well as
  hormones
 The mixture of enzyme sit
  creates breaks down
  carbohydrates, proteins, and
  fats
 Alkaline pancreatic juice
  also helps to neutralize the
  acidity of liquid food
  stopping any continuing
  pepsin actions
The liver and gallbladder
 The liver is another key
  component to the digestive
  system with many functions
 One of its functions is to
  produce bile, which is a
  chemical substance that
  breaks down fats
 Once bile is made in the
  liver it is stored in a small
  organ called the gallbladder
The large intestine

 What's left of your meal
  finally makes its way
  down to the large
  intestine large intestine
  is a muscular tube also
  known as the colon
 Coming off of the large
  intestine is the appendix
  which serves no purpose
  in the digestive system
Water Absorption and elimination of
waste
As the mixture passes through the large
 intestine water and salt are absorbed by the
 intestinal walls leaving behind more solid
 materials
After 18 to 24 hours in the large intestine the
 left over indigestible material is now
 considered a feces
The Rectum

The rectum is the last part of the digestive
 system
The feces are eliminated from the rectum
 through the anus
Your meals entire journey takes from 24 to 33
 hours

				
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posted:8/15/2012
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