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Transcript
The Wonderful World of
Digestion
Digestion Is A Factory
The function of
the
DIGESTIVE
SYSTEM
is to turn the
food we eat
into energy!!!

MECHANICAL
DIGESTION
 Food is ground in the
mouth by teeth
Mechanical
Digestion
(teeth)

CHEMICAL
DIGESTION
 Saliva begins
breaking down
carbohydrates into
simple sugars
Chemical
Digestion
(saliva)

Food enters the
stomach through the
esophagus

HYDROCHLORIC
ACID and PEPSIN
begin breaking
down the proteins.

Muscles in the
stomach work to
“grind” the food.
Esophagus
Stomach

Food enters the
SMALL INTESTINE
Enzymes from liver
and pancreas


Digestive enzymes
from the liver and
PANCREAS digest
the fats.
Nutrients enter the
blood through VILLI.
Small intestine
Nutrients absorbed into
blood
Small
intestine
Nutrients reach every
cell in the body from
the blood.
Circulatory
System
(blood vessels)
“Food” moves into the
LARGE INTESTINE
where some water,
vitamins and minerals
return to the blood.
The solid waste is
prepared to exit the
body.
C
i
r
c
u
l
a
t
o
r
y
s
y
s
t
e
m
D
e
s
c
e
n
d
i
n
g
Large Intestine
(transverse colon)
#2
#1
kidneys
c
o
l
o
n

http://www.youtube.c
om/watch?v=Bf_0es
cjyO4
Steps of
the
digestive
system
Step 1: food is chopped and
ground in the mouth

AKA: Mechanical
Digestion
 Canines and incisors
○ Tear and shred food
 Pre-molars and
Molars
○ Mash food into a
paste
Step 2: Saliva begins breaking
down starches into simple sugars

Chemical digestion
 Saliva changes
complex
carbohydrates into
simple sugars

Food is now known
as a “Bolus”
Step 3: The tongue muscles push
the bolus down the esophagus

It’s called
peri…what?!?!?!?
 Food is moved by an
involuntary wave-like
motion called
PERISTALSIS

Choke on this:
 When food travels
down the pharynx,
the epiglottis closes
over the larynx to
prevent food from
getting in your lungs!!
Step 4: Food enters the stomach
through the esophagus

Chemical digestion
 Done by
HYDROCHLORIC
ACID and PEPSIN

Mechanical
digestion
 Muscles in stomach
“work” the food into a
mixture called a
CHYME
Step 5: Chyme now enters the
small intestine

There’s nothing small
about it!!
 Is made of three parts
○ Duodenum
○ Jejunum
○ Illeum
 1 inch diameter
 10-24 feet long!!!!!

Nutrients are
absorbed by villi
 Taken through the body
by cardiovascular
system

Liver makes bile
 Stored in gall bladder
and released into small
intestine
Step 6: Chyme mixture enters
the large intestine

3 parts to the large
intestine
 Ascending colon
 Transverse colon
○ Where water and
vitamins are
absorbed back in
body
 Descending colon
○ Where wastes enter
the next step…..
Step 7: Waste is stored in the
rectum until nature calls…
Now that all the
“goodies” have been
taken out of the food,
we are left with fecal
matter
 Stored in rectum until
a mixture of voluntary
and involuntary
muscle contractions
(peristalsis) push it out

 AKA…#2

Exits through the anus
Now that’s a “rap”!!!!!!!!

http://www.youtube.c
om/watch?v=nj3KSn
OTRH0

http://www.youtube.c
om/watch?v=_QYws
cALNng