Transcript digestive system

DIGESTIVE SYSTEM
WHAT DO YOU KNOW ABOUT IT?
How long is it?
What is the purpose of the D.S.?
How long does it take to digest your food?
Mouth
Is Mechanical
digestion
• Teeth – Cuts or
Grinds the food
• Helps you to
swallow
• Saliva - water,
breaks down the
food through
• ENZYMES –
break down
starches into
glucose
tongue
1. Balls food
to the back
of the mouth
2. Helps you
swallow
3. taste
pharynx
Opening
to the
throat
Esophagus
12 inches long
Muscles push food
down..
Like a Snake
EPIGLOTTIS = flap
that blocks food
and water from
going into the
lungs.
Stomach
Is Chemical Digestion
Lined in MUCUS
(Protects From ACID)
Growling is Empty – Stomach
Muscles are Contracting
GASTRIC JUICES –
1. HYDROCHLORIC ACID:
Protects you from bacteria
2. ENZYMES:
Break down proteins and carbs into
something …called
BREAKS THE FOOD INTO CHYME –
CHYME GOES TO THE SMALL INTESTINE
MAIN FUNCTION OF THE STOMACH…
BREAK THE FOOD DOWN…LIKE A FOOD
PROCESSOR
SMALL INTESTINE
18 – 23 FEET LONG
1 inch in diameter
Function:
1 Chemical Digestion
2 Absorption of Nutrients are
completed
Villi = Tiny fingers contains
tiny blood vessels(capillaries)
absorb nutrients into the blood
stream
Large intestine
5 feet long
2.5 inches in diameter
Fiber and other materials
that are not broken down
go here and absorbed
Water absorbed into
intestinal wall
Chyme becomes FECES
Rectum
anus
Final phase of
the digestive
system.
Feces comes
from the
rectum and
out the Anus!
Kidneys
The filter system of the
body. 2 of them and they
are found in your back.
Kidneys filter waste out of
the blood and most liquid
is re-absorbed into the
blood stream.
1% is not useful and goes
to the bladder as urine.
LIVER
2 functions
1. It is warehouse where the blood takes all
the nutrients.
2. Also a FILTER like the kidneys…
Weights 3 ½ pounds
Produces BILE = breaks down fat
(remember fat does not dissolve in blood or water)
BILE Made in LIVER
Then it is sent to the GallBladder.
Next it goes to the small Intestine and
breaks down fat.
Finally, the BILE takes FAT to the walls of the
Sm. Int. and absorbed into the blood stream.
Tips to take care of
D.S.
1. Chew slowly
2. Brush and Floss
3. Exercise
4. Nutritious food…fiber foods 