Transcript The Digestive System

The Digestive System
The Digestive System

The digestive system breaks food down
into chemical nutrients that body cells
need for energy, growth, and repair.
Where Does Digestion Begin?


Think about the last
time you had hot,
cheesy Pizza for lunch.
The digestive process
started when you used
your canine teeth to
bite off a piece of
pizza.
What Happened Next?


As you used your molars to chew and mash
the pizza, saliva from your mouth mixed
with the mashed up pizza to form a slimy,
wet ball of mush.
Next, your tongue pushed the slimy mass of
pizza into your esophagus.
Down The Hatch

After your tongue pushes the slimy mass of
pizza into your esophagus, peristalsis will
force the masticated wad of goo into your
stomach.

Peristalsis is the wavelike contraction of
muscles in the organs of the digestive
system.
Inside Your Tummy

Inside your stomach, strong muscles churn
the food with acid and other chemicals to
help break down the food even more.
What Happens Next?


From the stomach, the slimy mass of food is
moved to the small intestines. The small
intestines of an average 5th grader are
about 22 feet long.
Chemicals from the pancreas and
gallbladder help break the food down even
more.
Inside the Small Intestine

Finger-like bumps in the small intestines,
called villi, absorb nutrients from your food
into your blood stream.
Where Does the Food Go From
There?

From the small intestine, the mashed up goo
is pushed through to the large intestine. The
large intestines of an average 5th grader are
about 5 feet long.
Finally……..Poop Chute City
The waste products are
eliminated from your
body.
Homework Questions


What is peristalsis?
What are villi?