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Questions
on digestion
Monacia
Williams, Contributor
Question
1
(a)
(i) Using an annotated diagram ONLY,
illustrate where digestion occurs
in humans. [4 marks]
(ii)
Describe TWO features of the system
which makes it suitable for digestion.
[4 marks]
(b)
With reference to the products of
digestion in humans, illustrate why
the liver is sometimes referred to
as the 'chemical laboratory' of the
body. [7 marks]
ANSWERS
NOTE:
Before you attempt to answer any
question, you must read carefully
to understand what it is asking.
Make
careful note of the number of marks
assigned to each section, as this
will give you an indication of the
number of points you need to include
to get the maximum marks.
You
are to write your answer using the
same divisions given in the question.
In other words, identify the section,
(a) (i), write your answer, then move
on to (a) (ii) and so on.
(a)
What do you need to know to answer
part (a)?
You
need to know:
- how
to make an annotated diagram. This
is a diagram on which short, descriptive
notes are added to the labels. Notice
the word ONLY? This means that the
diagram should not have narrative
coming after it.
- The
structure of the alimentary canal
of humans well enough to draw and
label it.
- The
functions of the different areas
as this will assist you in making
your diagram annotated.
(b)
What do you need to know to answer
part (b)?
- What
does the word describe mean? In
describing, you need to say in words
the relevant characteristics that
make the feature suitable for its
role in digestion.
- What
is meant by 'features of the system'?
(c)
What do you need to know to answer
part (c)?
- What
are the products of digestion in
humans?
- What
does the term 'chemical laboratory'
mean?
- How
can you connect this term with what
you know about the liver?
Now
that we have analysed the question,
let us see if we can write the answers.
(See diagram)
(a)(i)
This section of the question requires
you to know not just the different
areas of the alimentary canal, but
the different glands associated with
it. The system has more than two features.
but the question only asks for TWO,
so your answer must be restricted
to the TWO that the question requires.
This
has the teeth that cut, tear and grind
food in preparation for enzyme action
and swallowing.
A
long, muscular organ which manoeuvres
the food for chewing. It helps to
mix the food with saliva and forms
the bolus, pushing it to the back
of the cavity in preparation for passage
down the oesophagus.
Join
me next week as we continue with the
answering of the question.
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Women
Sgt Valrie Levy from the Jamaica
Constabulary Force's Accident
Investigation and Recon-struction
Unit shows students Raniel Simms
(left) and Briton Marrett how
the Intoxilyzer 8000, or evidence
breathalyser machine, works.
The instrument is used to verify
alcohol levels in individuals.
- Rudolph Brown/Chief Photographer
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