Exploring Cells in Detail Education Presentation in 0 Hand Drawn Lightly Te_20240627_024654_0000.pdf

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1. Exploring
Cells in Detail
An introduction to observing cells
with a light microscope

2. What body organ has tissue that
resembles this when viewed
under the microscope?
Guess the
Picture

3. You guessed it right! It's a
microscopic view of lung tissue.
Scientists and researchers use
microscopes to see objects and
structures too small to be visible
to the naked eye.
Lung tissue
Guess the Picture

4. Today, you will...
Describe why cells are called
the building blocks of life
Name the parts of a light microscope
Explain how to use a microscope

5. A cell is the smallest unit of a living
thing. It is the basic building block of all
living organisms. What is a cell?
plant cell animal cell

6. A living thing may be made
of one cell (a unicellular
organism) or many cells (a
multicellular organism).
What is
a cell?
Humans have about
37.2 trillion cells!
Humans are
multicellular organisms.
Euglena is a
unicellular
organism.

7. Who coined the term ‘cell’ and
how did he discover it?
Discovering
the Cell

8. Robert Hooke coined
the term ‘cell’ in 1665.
Whilst observing plant cells, he
marvelled at how similar they looked
to the cells in monasteries. At that
time, Hooke was actually looking at
the cell walls of cork cells.
Robert Hooke
Discovering the Cell
(Answer Key)

9. Cell sizes can vary from about
0.001 mm to 0.1 mm long.
To see cells up close, we use a
light microscope. It provides a
magnified image of small
structures and samples.
The Light
Microscope

10. rotating nosestagemirror/light source
fine adjustment wheel
objective lenses
apertureeyepiece
coarse adjustment wheel
Parts of a Light
Microscope
Try to label all the main parts
of a light microscope.

11. rotating
nose
stage
mirror/light
source
fine
adjustment
wheel
objective
lenses
aperture
eyepiece
coarse
adjustment
wheel
Parts of
a Light
Microscope
To use the microscope well,
you must be familiar with its
main parts.
Answer Key

12. How to Use a
Microscope
If you have never used a light
microscope before, this handy
guide will explain how it’s done!
Turn the light microscope on, move
the mirror to reflect the light up
towards the eyepiece and check
that the aperture is wide open.
Step 1:
Turn the revolving nosepiece
so the lowest objective lens is
pointing directly down.
Step 2:

13. How to Use a
Microscope
If you have never used a light
microscope before, this handy
guide will explain how it’s done!
Place your specimen
onto the stage.
Step 3:
Look into the eyepiece and slowly
rotate the coarse adjustment wheel
to bring your specimen into focus.
Step 4:

14. How to Use a
Microscope
If you have never used a light
microscope before, this handy
guide will explain how it’s done!
Slowly rotate the fine adjustment
wheel until you obtain a clearer
image of your specimen.
Step 5:
Examine and explore your
specimen, holding still or moving
the slide slowly with your thumbs.
Step 6:

15. How to Use a Microscope
If you have never used a light microscope before,
this handy guide will explain how it’s done!
Once you have seen enough, switch
to the medium and the high-power
objective lens. Use the fine
adjustment wheel to bring the
specimen into focus as necessary.
Step 7:
What are the things
you would like to
observe under a
microscope?

16. Tracing the
Path of Light
Look at the diagram of a microscope shown
here. Using your finger, track the path of the
rays of light from the source to the eyes of the
observer.
In line with your answer above, why is it
necessary for specimens to be very thin?

17. Tracing the
Path of Light
Light rays go through the aperture, to the specimen, to
the objective lens, then to the eyepiece and into the
eye.
But remember, light rays bend as they pass through the
lenses, allowing the image to be magnified.
The main idea of a light microscope is for the light rays
to go through the specimen! So, specimens must be
thin enough for the light to pass through.
Answer Key

18. Summary
A cell is the smallest unit of a living
thing. An organism may be made of one
cell or many cells.
What are cells?
A microscope magnifies the
structure of the specimen.
Specimens must be brought
into focus to be viewed. This
is done by moving the
coarse and fine adjustment
wheels.
How does a
microscope work?

19. Assignment: Preparing the Specimen
Use the internet or resources in your
library to find the answer to this
question. Then, get ready to collect
and prepare the specimen the
following day.
How do you prepare
mounts of both cheek cells
and onion epidermis?

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