Transcript Science Differentiation in action

Lesson: Digestive System
Science Differentiation in action
All living things are made up of cells.
Food has to be
broken down
before it is
transported to
every cell.
Science Differentiation in action
Our digestive system
breaks down food and
absorbs it so it can be
transported around our
bodies.
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Parts of our digestive system
mouth
oesophagus
liver
large intestine
stomach
pancreas
small intestine
Science Differentiation in action
Parts of our digestive system
mouth
where food is
chewed and
mixed with saliva
Science Differentiation in action
Parts of our digestive system
oesophagus
the tube that
carries food to
the stomach
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Parts of our digestive system
stomach
stores food and
mixes it with
digestive juices
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Parts of our digestive system
small intestine
the tube where broken
down food is absorbed
into the blood
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Parts of our digestive system
large intestine
passes water back
into the blood leaving
solid waste
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Parts of our digestive system
pancreas
makes
digestive enzymes
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Parts of our digestive system
liver
makes bile which
helps to break down
fats
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What is the function of each part?
mouth
oesophagus
liver
large intestine
stomach
pancreas
small intestine
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Nutrition involves 5 stages.
Ingestion
Digestion
Absorption
Assimilation
Egestion
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Teeth
break down food
into smaller pieces
(physical digestion)
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There are four types of teeth.
Upper or
maxillary
teeth
Lower or
mandibular
teeth
Incisors
Canines
Premolars
Molars
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Molars
Premolars
Incisors
Canines
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Teeth
Incisors
Canines
Premolars
Molars
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Teeth
Incisors –
cut food
Canines –
tear food
Premolars – grind food
Molars –
grind food
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Review Questions:
Label each part.
E
A
F
B
C
G
D
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Question to think about
Enzymes are involved in chemical digestion.
What do you think this means?
Enzymes act
here!