2. The process by which the Digestive
System breaks down food into molecules
the body can use.
There are two types of digestion:
1)Mehanical
2)Chemical NEXT

3. During mechanical digestion
foods are physically broken
apart into smaller pieces
NEXT

4. During chemical digestion
chemicals produced by your
body break large molecules
into smaller ones that your
body can use NEXT

5. •Because MECHANICAL digestion
breaks down food into small
pieces, CHEMICALS can digest the
food faster
•Most of the chemicals involved in
digestion are ENZYMES, substances
that speed up chemical reactions

6. During mechanical digestion
chemicals produced by your body
break large molecules into
smaller ones that your body can
use

7. During mechanical digestion foods
are physically broken apart into
smaller pieces

8. Click picture to advance
During CHEMICAL DIGESTION
chemicals produced by your body
break large molecules into smaller
ones that your body can use

9. • WHERE DOES
DIGESTION BEGIN? MOUTH
INGESTION happens
here
(TAKE IN FOOD)
THE MOUTH begins
the digestion of
CARBOHYDRATES
Carbohydrates (CHO)=
nutrients made of
carbon, hydrogen, and
Click picture to advance oxygen

10. TEETH
•32 teeth
•Tear, crush, and grind
your food into small
pieces
•MASTICATION:
• Chewing process
by which food is
mashed and
Click picture to advance crushed by teeth

11. •MECHANICAL
DIGESTION
TEETH
TYPES OF TEETH:
•Incisors
WHY? • Cut food into
bite sized pieces
• Foods are physically •Canines
being broken apart into • Tear and slash
food
smaller pieces by teeth •Premolars
• Crush and grind
food
•Molars
• Crush and grind
food

12. Let’s Review….
The process by
which the
digestive system
breaks down A) Digestion
food into B) Mastication
molecules the C) Ingestion
body can use is
called?

13. There are two types:
1)Mechanical: Foods are physically
broken apart into smaller pieces
2)Chemical: Chemicals produced by your
body break large molecules into smaller
ones that your body can use
NEXT
Click picture to advance
Click on DIGESTION to see a video clip

14. Mastication is also known as the
chewing process.
Mastication aids in mechanical
digestion by the TEETH

15. Ingestion occurs when the food first
enters the mouth

16. Click SO FAR to advance
SO FAR ….
• 2) TEETH
• 1) MOUTH ▫ MASTICATION
▫ INGESTION ▫ MECHANICAL
DIGESTION

17. • TWO FUNCTIONS SALIVARY
GLANDS
1. Moistens and lubricates
food
2. Adds enzymes to begin
breaking down
carbohydrates
Click picture to advance

18. •SALIVA SALIVARY
▫ Contains enzymes that GLANDS
start the digestion of
carbohydrates-which
are converted to
glucose
▫ Moistens the bites of
food into a slippery
mass that can be easily Click picture to advance
swallowed

19. •CHEMICAL SALIVARY
DIGESTION GLANDS
WHY?
• An enzyme in saliva
begins to break down the
starches in your food
Click picture to advance

20. FUNCTIONS: TONGUE
• Pushes food around
• Makes food into a ball to
help you swallow
Click picture to advance

21. The functions of the SALIVARY
GLANDS is are:
1) Moisten and lubricate food
2)Add enzymes to begin breaking
down carbohydrates

22. The functions of the SALIVARY GLANDS are:
1) Moisten and lubricate food
2) Add enzymes to begin breaking down carbohydrates
Saliva
1) Contains enzymes that start the digestion of
carbohydrates-which are converted to glucose
1) Moistens the bites of food into a slippery mass that
can be easily swallowed
Click picture to advance

23. Click REMEMBER to return to the True/False question
The functions of the SALIVARY GLANDS are:
1) Moisten and lubricate food
2) Add enzymes to begin breaking down carbohydrates
Saliva
1) Contains enzymes that start the digestion of
carbohydrates-which are converted to glucose
1) Moistens the bites of food into a slippery mass that
can be easily swallowed

24. MOUTH: INGESTION
TEETH: MASTICATION
MECHANICAL DIGESTION
SALIVARY GLANDS:
CHEMICAL DIGESTION
TONGUE:
MAKES FOOD INTO A
BALL
DIGESTIVE PROCESS

25. WHERE DOES CHEMICAL DIGESTION
OCCUR?
A) MOUTH
B) TEETH
C) SALIVARY
GLANDS
D) TONGUE

26. A) MOUTH
• REMEMBER, the
mouth begins the • The mouth also starts
digestive process by the digestion of
ingesting food CARBOHYDRATES
(INGESTION)

27. B) TEETH
• 32 teeth • MASTICATION:
tear, crush, and grind ▫ Chewing process
food into small pieces  Incisors, canines,
premolars, and
• MECHANICAL molars
DIGESTION:
▫ Food is physically
being broken apart
into smaller pieces

28. C) SALIVARY GLANDS
NEXT

29. D) TONGUE
• FUNCTIONS: • CHEMICAL DIGESTION
does not occur
▫ Pushes food
around • MECHANICAL
▫ Rolls food into a DIGESTION does not
occur
ball to help you
swallow

30. DIGESTION is a PINBALL MACHINE
PINBALL=FOOD
Click on “DIGESTION is a PINBALL MACHINE” for more information on digestion
Click on “PINBALL=FOOD” for an interactive diagram
• MOUTH:
▫ PINBALL BEGINS
JOURNEY
• TEETH:
▫ PINBALL GOES THROUGH
A CHOMPING
MASTICATOR
• SALIVARY GLANDS:
▫ PINBALL GETS RAINED ON
• TONGUE:
▫ TRAP DOOR “GRABBER”
Click picture toreturn to the
ROLLS FOOD AND SENDS
beginning
IT ON ITS WAY DOWN THE
ESOPHAGUS TO BE CONTINUED…….