Digestive System
By: Diana Romero, Aspen Clawson, and Jordan
Jeffrey
Basic Digestive System of
Mammals
 Basic Digestive System: The basic
digestive system is composed of a
mouth, where the food enters, an
esophagus the tube that connects the
mouth to the stomach, the stomach is
where food starts to digest. Then to the
small and large intestines where
nutrients is absorbed and bacteria is
ejected from digested food. Then down
to rectum and to the anus, where food
leaves the body.
 Main Function of the Basic Digestive
System: The main purpose of the
digestive system is to absorb and break
down food into small molecules and
absorb into the body. The digestive
system is divided up into two parts: the
digestive tract. The digestive tract is a
continuous tube with two openings: the
mouth and anus. The liver has multiple
functions, it is to process the nutrients
absorbed from the small intestine. The
digestive system also converts food into
energy and waste.
Contrast Of Human, Fish, and
Bird Digestive System
 Human Digestive system:

Fish Digestive system:
 The human digestive system has many
parts: the mouth, the esophagus, the
stomach, the liver, the gallbladder, the
pancreas, the small and large intestine,
the rectum, and the anus. The function
of the human digestive system is to
break down food eaten and to supply
nutrients to the human body.

The fish digestive system has many different
parts: the mouth, the esophagus, the
stomach, the intestines and the anus. The
main function of the digestive system in the
fish is to break down food to absorb nutrients
for the fish’s body.

. Bird Digestive System:

The bird digestive system has many different
parts: the mouth, the esophagus, the crop, the
stomach, the gizzard, the intestine (large and
Small), the rectum and Urinary Vent. The main
function of the bird digestive system is to
break down food and absorb nutrients for
further use


Comparison of Human, Fish, and
Bird Digestive Systems
 Comparison:
 All birds, fish and humans have mouths, esophagus, stomach,
and intestines.
 Birds have as many parts as the human only 2 less while a fish
consists of basic parts of a digestive system.
.
Fish Digestive System
Label the Fish as the Powerpoint
goes along.
A Fish has a Mouth located at the front of the fish’s body. It
helps to take in the food into the body.
Mouth
A fish has an esophagus. An esophagus is an tube that connects the
Mouth to the stomach and uses muscle contractions to transport the food.
Mouth
Esophagus
A fish has a stomach. The stomach is where food Is placed until it
Goes to the intestines. In some fishes, stomachs aren’t very useful but some
Do indeed have stomachs. Others do not.
Stomach
Mouth
Esophagus
A fish has a large and small intestine. The large intestine absorbs
Nutrients and the small intestine takes away any toxins.
Small Intestine
Large Intestine
A fish has an anus. The anus is where the food is dispersed from the
Body.
Small Intestine
Large Intestine
Anus
Now we will go on with the Bird’s
digestive system. Please Finish
The fish worksheet
Bird Digestive System
Label the Bird Digestive System As the Powerpoint goes along
All birds have mouths inside their beaks.
As you know mouths are used as the entrance
for food into the body.
Mouth
A bird has an esophagus. An esophagus is used to
transport the food
To the stomach using muscle contractions to move
the food downward.
Esophagus
All birds have a crop. A crop is what a bird uses to help hold food in
case it can’t fit in the stomach.
Crop
All birds have stomachs. The function of the stomach is to hold food
and also start digesting the food.
Stomach
All birds have gizzards. The function of a gizzard is to help the
Bird grind up the food.
Gizzard
All Birds have a large and small intestine. The large intestine absorbs
Nutrients and the small intestine takes away any toxins.
Large
Small
Intestine Intestine
All birds have an anus, and urinary vent that work together to excrete
waste from the digestive system.
Anus
Urinary
Vent
Now Finish labeling the bird
Digestive System and we will
Be moving on to the Human
Digestive System
Label the Human Digestive System as the PowerPoint goes on
Human Digestive System
Human Digestive
System
All humans have a mouth where food is taken in
Mouth
All humans have an esophagus that connects the mouth to the
stomach
Mouth
Esophagus
All humans contain a liver where bile(a digestive fluid) is produced
Mouth
Esophagus
Liver
All humans contain a stomach that does chemical and mechanical
digestion using acids and churning
Mouth
Esophagus
Liver
Stomach
All humans have a pancreas that Produces a juice that contains
Enzymes, which break down carbohydrates, fats, in food.
Mouth
Esophagus
Liver
Stomach
Pancreas
All humans contain a gallbladder that stores bile and releases
it when needed.
Mouth
Esophagus
Liver
Gallbladder
Stomach
Pancreas
All humans contain a small intestine that finishes digestion
and absorbs soluble food.
Mouth
Esophagus
liver
Gallbladder
Stomach
Pancreas
Small Intestine
All humans contain a large intestine that serves as a reservoir
for liquids that are transmitted from the small intestine.
Mouth
Esophagus
Liver
Stomach
Gallbladder
Pancreas
Large Intestine
Small Intestine
All humans contain an appendix that is really useless.
Mouth
Esophagus
Liver
Gallbladder
Large Intestine
Appendix
Stomach
Pancreas
Small Intestine
Humans contain a rectum that stores solid waste until it is released.
Mouth
Esophagus
Liver
Stomach
Gallbladder
Pancreas
Large Intestine
Small Intestine
Appendix
Rectum
Humans contain an anus that serves as the outlet of the digestive
Tract.
Mouth
Esophagus
Liver
Gallbladder
Large Intestine
Appendix
Anus
Stomach
Pancreas
Small Intestine
Rectum
Please Finish
The Human worksheet
and turn in.