1. Public facilities specially designed for the visually-impaired
braille map showing the layout of the MTR station

2. vibrates in different patterns according to the states of the lights
traffic light
tactile unit

3. audible device
gives out sound signals according to the states of the lights
traffic light

4. 1
How do we detect stimuli in our surroundings?

5. 2 Which senses do the visually-impaired depend
on when they are using the above facilities?

6. 3
Is our sense always reliable?

7. 11.1 The importance of sensing the environment

8. 11.1 The importance of sensing the environment
Living things are able to detect and respond to changes in the environment.

9. When it smells the scent of nectar…
11.1 The importance of sensing the environment
When it smells the scent of nectar…

10. When rabbits hear their enemies coming …
11.1 The importance of sensing the environment
When rabbits hear their enemies coming …
Run away!

11. receptors (感受器) of a sense organ (感覺器官)
11.1 The importance of sensing the environment
stimuli (刺激)
detected by
receptors (感受器) of a sense organ (感覺器官)
send messages through nerves (神經) to
brain
produces
sense (感覺)

12. Touch (觸覺) We have five senses. Hearing (聽覺) Smell (嗅覺) Senses Sight
11.1 The importance of sensing the environment
Touch
(觸覺)
We have five senses.
Hearing
(聽覺)
Smell
(嗅覺)
Senses
Sight
(視覺)
Taste
(味覺)

13. 11.1 Sense organs and senses 1 Sight
11.1 The importance of sensing the environment
11.1
Sense organs and senses
1 Sight
Our ______ can detect light in the environment.
eyes

14. 11.1 2 Hearing Our ______ can detect sound in the environment. ears
11.1 The importance of sensing the environment
11.1
2 Hearing
Our ______ can detect sound in the environment.
ears

15. 11.1 3 Touch Our ______ can detect hot, cold, pressure and pain. skin
11.1 The importance of sensing the environment
11.1
3 Touch
Our ______ can detect hot, cold, pressure and pain.
skin

16. 11.1 4 Smell Our ______ can detect the smells of substances. nose
11.1 The importance of sensing the environment
11.1
4 Smell
Our ______ can detect the smells of substances.
nose

17. 11.1 5 Taste Our ________ can detect the taste of food. tongue
11.1 The importance of sensing the environment
11.1
5 Taste
Our ________ can detect the taste of food.
tongue

18. Skin Sense organs Ears Nose Eyes Tongue
11.1 The importance of sensing the environment
Skin
We have five sense organs.
Sense
organs
Ears
Nose
Eyes
Tongue

19. detect stimuli, leading to the sense of
11.1 The importance of sensing the environment
Eyes
Ears
Skin
Nose
Tongue
detect stimuli, leading to the sense of
sight
hearing
touch
smell
taste

20. Living things use their sense organs to detect environmental stimuli.
11.1 The importance of sensing the environment
Living things use their sense organs to detect environmental stimuli.
The ability to detect and respond to stimuli is important for survival.

21. The stimuli which our sense organs detect and the senses produced:
11.1 The importance of sensing the environment
The stimuli which our sense organs detect and the senses produced:

22. Chemicals in food and drinks Taste
11.1 The importance of sensing the environment
Sense
organ
The stimulus the
sense organ detects
Eye
Light
Sight
Ear
Sound
Hearing
Skin
Hot, cold, pressure, pain
Touch
Nose
Chemicals in air
Smell
Tongue
Chemicals in food and drinks
Taste

23. 1 Stimulus Sense organ Sense a Light from TV Eye Sight23
11.1 The importance of sensing the environment 1
Stimulus
Sense organ
Sense
a Light
from TV
Eye
Sight

24. 1 Stimulus Sense organ Sense b Sound from TV Ear Hearing24
11.1 The importance of sensing the environment 1
Stimulus
Sense organ
Sense
b Sound
from TV
Ear
Hearing

25. 1 Stimulus Sense organ Sense c Sweetness of hot chocolate Tongue Taste25
11.1 The importance of sensing the environment 1
Stimulus
Sense organ
Sense
c Sweetness
of hot
chocolate
Tongue
Taste

26. 1 Stimulus Sense organ Sense d Smell of hot chocolate Nose Smell26
11.1 The importance of sensing the environment 1
Stimulus
Sense organ
Sense
d Smell
of hot
chocolate
Nose
Smell

27. 1 Excellent! Stimulus Sense organ Sense e Softness of cushion Skin27
11.1 The importance of sensing the environment 1
Stimulus
Sense organ
Sense
e Softness
of cushion
Skin
Touch
Excellent!