Digestive System Functions
 The Digestive System has 3 very important jobs:
 Ingest (bring in food)
 Digest (break down food)
 Egest (get rid of unusable food)
Digestive System
 Mouth
 Esophagus
 Stomach
 Small Intestine
 Large Intestine
 Rectum
Digestion
 Digestion is the process of both physically and
chemically breaking down food into usable resources
for the body.
 Involves both:

Physical changes 

Chemical changes

First Stop: Mouth
 The mouth is the place where
food enters the body. The
mouth breaks food down both
physically and chemically.
 Physical Breakdown  chewing
 Chemical Breakdown 
enzymes

Specifically carbohydrates!
Esophagus and Stomach
 The esophagus leads to the
stomach.
 The stomach also physically
and chemically breaks
down food.
 Physical  the stomach
churns, grinding food into
smaller pieces
 Chemical  Enzymes and
acids present to break
down proteins
Stomach
 The proteins are broken
down into smaller
pieces called amino
acids.
Small Intestine
 The small intestine is a very long, thin tube that leads
away from the stomach.
 The small intestine is 7m long!
 Three organs dump more enzymes into the small
intestine for further chemical digestion
 Chemical breakdown of fats, more proteins, and more
sugars occurs in the small intestine.
 Food is also mechanically broken down and pushed
through the small intestine.
Small Intestine
 The pancreas, liver, and
gallbladder add enzymes into
the small intestine to allow for
further chemical digestion of
food
 The small intestine is the last
place of digestion in the system!
 The small intestine is where he
absorption of the breakdown
down food occurs
Last Stop - Large Intestine/Rectum
 The large intestine has the job
of absorbing water from the
remaining waste.
 The large intestine leads to the
rectum, and outside of the
body.
Review