Digestive System- Pop Quiz
1. Chemical digestion in the stomach involves:
a)
b)
c)
d)
the breakdown of starch by the enzyme amylase
the enzyme pepsin digesting proteins
the enzyme trypsin which breaks the bond between polypeptides
digesting proteins from enzymes released by the pancreas
2. What is the function of Hydrochloric Acid in the stomach?
a)
b)
c)
d)
Kill bacteria
Provide an acidic environment for optimal functioning of pepsin
Activation of pepsinogen to its active form
All of the above
3. A full set of teeth consists of
a)
b)
c)
d)
36 teeth
32 teeth
28 teeth
24 teeth
The table below indicates in which part of the digestive system a particular food is
chemically digested.
Section of digestive
tract
Mouth
Stomach
Small intestine
Food 1
Food 2
Food 3
Food 4





4. Which of the foods shown above would most likely be a protein?
a)
b)
c)
d)
Food 1
Food 2
Food 3
Food 4
5. The sites of mechanical digestion in the body are:
a.
b.
c.
d.
mouth and oesophagus
mouth, oesophagus and stomach
mouth only
mouth and stomach
6. Which of the following shows the correct relationship between a molecule and its
building block?
a.
b.
c.
d.
Glucose  fat
Amino acid  protein
Glycerol  glycogen
Fatty acids  starch
7. The basic units which comprise lipids are called:
a.
b.
c.
d.
fatty acids and glycogen
lipase and glucose
amino acids and lipase
glycerol and fatty acids
8. The main effect of the presence of intestinal villi is to:
e.
f.
g.
h.
move food along the intestine
surround and digest food particles
greatly increase the area over which absorption of food can occur
act as valves to prevent a flow of food in the wrong direction
9. The function of sphincters in the digestive tract is to:
i.
j.
k.
l.
take part in the absorption of food
confine food to one section
propel the food through the tract
churn the food around
10. Which one of the following is NOT secreted in the stomach:
m.
n.
o.
p.
mucus
hydrochloric acid
trypsin
pepsin
a. Examine the diagram of a section of the alimentary canal and label each of the
structures in the table
Structure
Name
A
B
C
E
(3 marks)
b. Bile has a similar action to detergent.
i)
Where is it produced?
___________________________
ii)
Where is it stored?
___________________________
iii)
What nutrient group does it target?
___________________________
iv)
How does it break down this nutrient?
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
(5 marks)
c. Examine the diagram below which illustrates how food moves from the mouth to the
stomach.
(i) What is the name of this process?
(1 mark)
_____________________________________________________________________
(ii) What is the name of the ball of food swallowed?
(1 mark)
___________________________________________________________________
(iii) Identify two substances used to lubricate the ball of food as it moves from the
mouth to the stomach? Identify what structures release each of these substances.
(2 marks)
_____________________________________________________________________
_____________________________________________________________________
(iv) Describe exactly how this process occurs down the length of the oesophagus.
(2 marks)
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________