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Public facilities specially designed for the visually-impaired
braille map showing the layout of the MTR station
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traffic light
vibrates in different patterns according to the states of the lights
tactile unit
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gives out sound signals according to the states of the lights
audible device
traffic light
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1 How do we detect stimuli in our surroundings?
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2 Which senses do the visually-impaired depend on when they are using the above facilities?
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3 Is our sense always reliable?
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The importance of sensing the environment
11.11.11
11.1 The importance of sensing the environment
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Living things are able to detect and respond to changes in the environment.
11.1 The importance of sensing the environment
911.1 The importance of sensing the environment
When it smells the scent of nectar…
1011.1 The importance of sensing the environment
When rabbits hear their enemies coming …
Run away!
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stimuli (刺激 )
receptors (感受器 ) of a sense organ (感覺器
官 )
brain
sense (感覺 )
11.1 The importance of sensing the environment
detected by
send messages through nerves ( 神經 ) to
produces
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We have five senses.
Touch(觸覺 )
Smell(嗅覺 )
Taste(味覺 )
Sight(視覺 )
Hearing(聽覺 )
Senses
11.1 The importance of sensing the environment
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11.1Sense organs and senses
1 Sight
Our ______ can detect light in the environment.
eyes
11.1 The importance of sensing the environment
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11.1
2 Hearing
Our ______ can detect sound in the environment.
ears
11.1 The importance of sensing the environment
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11.1
3 Touch
Our ______ can detect hot, cold, pressure and pain.
skin
11.1 The importance of sensing the environment
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11.1
4 Smell
Our ______ can detect the smells of substances.
nose
11.1 The importance of sensing the environment
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11.1
5 Taste
Our ________ can detect the taste of food.
tongue
11.1 The importance of sensing the environment
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We have five sense organs.Skin
Nose
TongueEyes
EarsSenseorgans
11.1 The importance of sensing the environment
1911.1 The importance of sensing the environment
Eyes Ears Skin Nose Tongue
sight hearing touch smell taste
detect stimuli, leading to the sense of
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Living things use their sense organs to detect environmental stimuli.
The ability to detect and respond to stimuli is important for survival.
11.1 The importance of sensing the environment
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The stimuli which our sense organs detect and the senses produced:
11.1 The importance of sensing the environment
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Sense organ
The stimulus the sense organ detects
Sense
Eye Light Sight
Ear Sound Hearing
Skin Hot, cold, pressure, pain
Touch
Nose Chemicals in air Smell
Tongue Chemicals in food and drinks
Taste
11.1 The importance of sensing the environment
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StimulusSense organ
Sense
a Light from TV
Eye Sight
11.1 The importance of sensing the environment
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StimulusSense organ
Sense
Ear Hearing
11.1 The importance of sensing the environment
b Sound from TV
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StimulusSense organ
Sense
Tongue Taste
11.1 The importance of sensing the environment
c Sweetness of hot chocolate
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StimulusSense organ
Sense
Nose Smell
11.1 The importance of sensing the environment
d Smell of hot chocolate
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1111.1 The importance of sensing the environment
StimulusSense organ
Sense
Skin Touch
Excellent!
e Softness of cushion
