Transcript digestive system lesson

Where does our food go, and how does it
come out looking completely different?
Spelling Test
Oven
Sugar
Paring knife
Simmer
Bridge
Claw
Oats
Flour
Fibre
Digestive system
Disease
Diabetes
Obesity
Learning Objectives : To be able to
explain(make links) what happens to
our food.
Grade
Success Criteria
1
I will be able to identify what happens to food
when it passes through the body
2
I will be able to explain and expand on what
happens to food when it passes through the
body
3
I can discuss the physical changes of food as
they are digested
Card Sort – What is the correct order?
Mouth
Gullet
Stomach
Small Intestine
Large intestine
Anus
What did you have for breakfast today?
Where do you think that food is now?
Teeth
We use our _______________
to grind down
the food, making it easier to swallow.
This is a PHYSICAL CHANGE – although our
food does not look the same as when we ate it, it
is still what we put in.
Saliva
Our mouths also contain ____________,
which
has a substance in it which begins to chemically
break food down. This is called an ENZYME.
• Our food is made up of very long chains which can be difficult
to break. They are locked together
• What do we use to unlock things?
• An enzyme is basically a key to unlock these long chains, and
break them in to smaller pieces which we can deal with
swallow
When we ____________________,
the food
moves down the long
mouth
tube from the ____________
to the stomach.
This is NOT a chemical or a physical change.
• The stomach is the “washing machine” of the digestive
system, where food is mixed with digestive juices.
• Digestive juices are a mix of a______
–
cids and e__________
nzymes
both of which help to break down food.
• In the stomach, a CHEMICAL CHANGE occurs.
 In the __________
small intestine, more liquid is added and there
is some more mixing
 More “washing machine” style action – but things aren’t
necessarily staying where they are.
 Food that is broken down as much as it can be then goes to
energy
the blood to be used for _________.
 All food which has not been broken down up to this point
large intestine.
reaches the ________
 Any water which is left in the food passes back to the body,
leaving “solid” material.
CHEMICAL AND PHYSICAL CHANGE
 Solid waste left moving in the large intestine is EXCRETED
through the anus in the form of faeces (POO).
PHYSICAL CHANGE
Learning Objectives : To be able to
explain(make links) what happens to our
food.
Grade
Success Criteria
1
I will be able to identify what happens to food
when it passes through the body
2
I will be able to explain and expand on what
happens to food when it passes through the
body
3
I can discuss the physical changes of food as
they are digested
Enzyme
Blood
Teeth
Grinding
Small
intestine
Faeces
Mouth
Intestine
Gullet
Stomach
Saliva
Digestive
Juices
Chemical
Change
Physical
Change
Large
intestine
• Choose six of the words from the grid and listen out for the
clues from your classmates
 When the clue to one of your words comes up, then cross it off.