Electricity in biology

1. ELECTRICITY IN BIOLOGY

2. WHO/ WHERE/ WHEN?
• In May, class second A was at the University of Gdańsk.
Thanks to our biology teacher Ms. Piełowska we could
meet a professor, who tried to explain us a few topics from
physics and generally science. Excercises were very
interesting and gave us answer to many questions. How
about seeing what we were doing?

3. • At the beginning we
were checking current
flow on our skin.
• Proffesor told us about
Ohm’s law, wchich
operates in physics.
• We used special
equipment to this
research like
electrostatic machine.
INTRODUCTION

4. All the photos in the presentation/film were taken on our own

5. • We also heard about
Luigi Galvani. He was
an Italian doctor.
Thanks to frog’s leg he
figured out the truth
about tension and
potencial - because the
death animal was
moving. It was in 1780.
SOME THEORIES

6. All the photos in the presentation/film were taken on our own

7. • There are also some
species of electric fish. For
example, eel, catfish and
cramp-fish. Sometimes they
can create 300-600 watt
voltage! They are using
current mainly to hunt, kill
victim or communicate.
Remember, they are
dangerous for humans.
WONDERFUL TREATMENT

8. All the photos in the presentation/film were taken on our own

9. • Professionaly it is called
reflex knee. It is connected
with the impact of hammer
on the kneecap. The
natural reaction is that part
of human’s body will move
up. It doesn’t hurt because
the hammer is pneumatic. It
is helpful in checking
nervous system.
LET’S PRACTISE!

10. All the photos in the presentation/film were taken on our own

11. • We have found out what is
hyperventilation and slowed
breath. We have seen on
our eyes how it works. First
our classmate had to put
the head out the window
and breathe very fast for a
few minutes. Then we
plugged him to special
device and saw on the
graph what happened with
his body inside.
BREATH

12. • We have also got chance to
check other parameters like
blood pressure, sweating
hands and body
temperature. One person
was sitting on the chair and
we were trying to influence
on the result of experiment.
For example, we scared or
distracted our friend.
ALL PARAMETERS

13. • One person was kicked by
the current. She was
holding wet paper on the
hand which was conductor
of electricity and the
teacher increased the
power. After a few minutes
the fingers were shaking
and the thumb folded up.
The person couldn’t do
anything with it.
THE THUMB

14. • At the end we measured
force of palm. Girl and boy
were holding the device
very tightly for a few
seconds. We saw on the
screen who was stronger
and who had better
durability. It isn’t as easy as
it looks like.
WOMEN VS MEN

15. SOURCES:
 http://agrobiznes.money.pl/artykul/ryby-
elektryczne,59,0,1801275.html
 http://antysocjal.blog.onet.pl/2009/05/14/prawo-galvaniego/
 http://pl.wikipedia.org/wiki/Odruch_rzepkowy
 http://www.szkolnictwo.pl/szukaj,Maszyna_elektrostatyczna

16. XX Secondary School in Gdańsk, Poland
Supervision: Agnieszka Jackiewicz
Consultation: Beata Piełowska
Authors: Katarzyna Boros

17. THANKS FOR YOUR
ATTENTION!