Worksheet: Digestion
1. Identify the main organs of the digestive system in the diagram below:
A
B
C
D
E
F
G
H
I
J
K
2. Complete the following sentences about chemical digestion.
The digestion of starch begins in the___________ and is broken down by an enzyme
called_____________. This digests starch into maltose, which is further broken down into
_______________ by the action of maltase. Enzymes called proteases break down
__________ into amino acids. This occurs in the_______________. Fat is broken down
into_________________ and ________________ by an enzyme called_________________.
3. Complete the following table which will provide a summary of the important features of the
different digestive enzymes:
Name of enzyme
Where is it produced?
What is the substrate and
product of this enzyme
Amylase
1.
Substrate =
2.
Product=
1.
Substrate =
2.
Product=
1.
Substrate =
2.
Product=
Protease
Lipase
4. Name the acid found in the stomach_______________________
5. What is the pH in the stomach?___________________________
6.
Explain why the pH of the alimentary canal changes at different points.
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
7. Where is bile made?_______________________________________
8. Where is bile stored until it is needed in digestion?
9. What is the function of bile in the digestive system?
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
10. Control of blood glucose levels by the pancreas. Draw lines to link the terms to the correct
definition for both sets of words:
Glucagon
A storage carbohydrate found in muscles and the liver
Glucose
Glycogen
A hormone that stimulates the liver to break down glycogen into glucose
A sugar used in respiration
Glycogenesis
The process of breaking down glycogen stores in the liver to release glucose
Glycogenolysis
Gluconeogenesis
The process of storing glucose as glycogen in the liver and muscle cells
The synthesis of new glucose from noncarbohydrate precursors
11. Identify where
insulin is produced and describe the role of insulin in your body.
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
12. Explain the role of the pancreas when your blood sugar levels rise above the ideal range
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
13. Explain the role of the pancreas when your blood sugar levels drop below the ideal range
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
14. Define the term ‘diabetes’.
___________________________________________________________________________
15. Explain the difference between type 1 diabetes and type 2 diabetes using the table below to
help you:
Age at onset
Type 1 diabetes
Type 2 diabetes
Are the beta cells of
the pancreas damaged
by the body’s own
immune system?
Do the insulin receptors on
liver and muscle cells start to
lose function due to obesity
and lifestyle?