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5.1 - Percieving your environment
Unit 5 Perception, behaviour and regulation
Grab your notebook and a pen
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Biologie
Middelbare school
vwo
Leerjaar 2
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Unit 5 Perception, behaviour and regulation
Grab your notebook and a pen
Slide 1 - Diapositive
Everybody gets one.
Describe this vegetable to your neighbour. (2 min)
Slide 2 - Diapositive
Today's lesson
- Introduction to your senses
- Which organs are we talking about?
- How do impulses start?
- How does your nervous system function?
Slide 3 - Diapositive
Learning objectives
5.1.1 You can describe how the senses work.
5.1.2 You are able to list the senses along with their locations and their stimuli.
Slide 4 - Diapositive
You can sense things around you. What can you sense around you? List 5 of your senses.
Slide 5 - Question ouverte
Slide 6 - Diapositive
Reacting to the surrounding
Stimulus (prikkel)
= information from the surrounding
Light, temperature, smell, sounds, skin contact
Stimulus -> sense organ -> impulse -> nerves -> brain
Brain responds with a impulse to the muscles to react
Slide 7 - Diapositive
Sensing things
Sense organ
: an organ that is sensitive to stimuli.
Stimulus
:
information
from the
surroundings
that has an
effect
on an organism.
Come up with three examples. (1 min)
Slide 8 - Diapositive
Sensing things
You see and smell chocolate.
Your
sense organs
send a signal
(impulse)
through your
nerve
to your
brain.
Slide 9 - Diapositive
Sensing things
Your
brain
sends impulse to your
arm muscle
-> you
grab
the chocolate.
Slide 10 - Diapositive
Responding to our environment.
Put these concepts in the right order.
Stimulus
Sense organ
Impulse
Nerve
Brain
Slide 11 - Question de remorquage
Adequate stimuli
A stimulus that sensory cells are particularly sensitive for
Sensory cells in your eyes respond to light
Light is the adequate stimulus
Slide 12 - Diapositive
Match the correct adequate stimulus to the sensory organ
Sound
Taste
Light
Smell
Slide 13 - Question de remorquage
How an impulse starts
Stimulus needs to be strong enough ->
threshold value
= the
lowest intensity
of stimulus
that causes an impulse.
Example: a sound needs to be loud enough to hear
-> Soft sounds don't cause impulses the lowest intensity of stimulus that causes an impulse.
Slide 14 - Diapositive
Non-adequate stimuli
Sometimes sensory organs will respond to other stimuli
When you get hit in your eyes, you will see "stars"
But, the threshold value is higher than for the adequate stimulus
Slide 15 - Diapositive
Habituation = gewenning
If a stimulus
doesn't go away for a long time
, your sensory cells will
produce less impulses
: they will make
the threshold value higher
!
You don't really feel your clothes on your body because of habituation.
Slide 16 - Diapositive
Which square is darker?
Slide 17 - Diapositive
Which square is darker?
Slide 18 - Diapositive
Sense organs = zintuigen
Eyes, ears, nose, tongue, skin
Together =
sensory system
Slide 19 - Diapositive
All sensory organs together =
sensory system
Slide 20 - Diapositive
Nervous system
Central nervous system
- Brain
- Spinal cord
Nerves
Slide 21 - Diapositive
Sense receptors in the skin
Heat receptors
Cold receptors
Pressure receptors
Touch receptors
Slide 22 - Diapositive
Sense organs send signals through the nerves to the ...
A
eyes
B
ears
C
brain
D
muscles
Slide 23 - Quiz
All your senses together form the ...
A
nervous system
B
sensory system
C
brain system
D
sense canal
Slide 24 - Quiz
What do you call the signals the sense organs send out?
Slide 25 - Question ouverte
What do we call the lowest intensity that can cause an impulse?
A
Adequate stimulus
B
Threshold value
C
impulse
D
habituation
Slide 26 - Quiz
If a stimulus does not go away for some time, it starts producing less impulses in the cell. What do we call this?
A
Adequate stimulus
B
Threshold value
C
impulse
D
habituation
Slide 27 - Quiz
Fill in the right words:
The smell of a fresh panini comes into your nose, this is called a .... Then a .... is sent through the nerves to the brain.
Slide 28 - Question ouverte
Slide 29 - Diapositive
Sensory cells
Sensory organs have
sensory cells
Which are connected to
nerves
When the sensory cells receive a
stimulus
they generate an
impulse
(kind of
electrical signal
)
Slide 30 - Diapositive
Get to work
Three minutes in silence:
Answer the questions from the beginning.
Write down any questions you still have.
After the timer has gone off
Discuss your answers and questions in small groups.
timer
3:00
Slide 31 - Diapositive
Slide 32 - Vidéo
Slide 33 - Vidéo
Homework
Read 5.1 in your book and watch video (link on Magister)
Do assignment 10 (Synasthesia)
When finished:
Task 19 and 20: assignments 5.1 (1, 2, 3, 5, 7 and 9)
Slide 34 - Diapositive
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