1. Enzymes in
digestion
WALT: To understand the role of enzymes in the
digestive system.
Sunday, 28 September 2014
WILF:
Identify the main parts of the digestive system and
state the function of digestion. (C)
Describe the location and action of enzymes that
breakdown carbohydrates, fats and lipids.. (B)
Explain digestion in relation to the molecules involved.
(A/A*)
Keywords
Carbohydrases
Proteases
Lipases
Amylase
Amino acids
Lipids
Fatty acids
Glycerol

2. What do we know about
enzymes so far?!
Starter
Complete the questions on
your work sheet to
summarise what you’ve
learnt about enzymes so
far.

3. List as many organs as
you can think of that are
involved in the digestive
system.
From this…
To this…

4. The Digestive
Mouth System
Liver
Oesophagus
(Gullet)
Stomach
Pancreas
Large
intestine
Gall bladder
Small
intestine
Anus

5. The digestive system
The alimentary canal (a muscular tube) along with a
range of organs and glands make up the digestive
system.
Function?
To break down large
insoluble molecules of
food into smaller soluble
ones, digestion.
e.g. carbohydrate
 glucose Peristalsis

6. Enzymes and the digestive system
Digestive enzymes:
~ work outside of your cells
~ produced by glands
~ pass into the gut and break down, catalyses, LARGE
INSOLUBLE MOLECULES into smaller soluble molecules

7. Carbohydrates
Broken down
into  sugars
Enzyme 
carbohydrase
Proteins
Broken
down into 
amino acids
Enzyme 
protease
Lipids (fats and
oils)
Broken down into
 fatty acids and
glycerol
Enzyme  lipase

8. B1
Link!
Diet and exercise (1.1)
Keywords
Malnourished
Metabolic rate
Inherited
C: List the components of a balanced
diet and define the term malnourished .
B: Describe how the amount of energy
you need to live depends on different
factors.
A/A*: Explain what the term metabolic
rate means and factors which can affect
it.
Pgs. 24-25

9. Task 1: Complete Qu 1.
from the summary box
on pg 169.
Task 2: Explain how
digestive enzymes are
different to other
enzymes in the body.
Task 3: Glue in and
complete the table
showing the function of
the different digestive
enzymes in the body.
Large molecule Smallmolecule Enzyme Where is it
produced?
Carbohydrates
Proteins
Lipids

10. Investigating digestion
Test for starch?
Use iodine, a positive result
is shown as blue-black
colour.
Test for sugar (glucose)?
Use Benedict’s, a positive
result is shown as red colour.

11. Odd One Out!
Spot the odd one out in
these lists and give a
reason for your answer.
There may be more than
one answer!
1. Carbohydrases, proteases,
glucose
2. Lipids, proteins, amino
acids

13. Large
molecule
Smallmolecule Enzyme Where is it produced?
Carbohydrates
Proteins
Lipids
Large
molecule
Smallmolecule Enzyme Where is it produced?
Carbohydrates
Proteins
Lipids