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

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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

2323

11

StimulusSense organ

Sense

a Light from TV

Eye Sight

11.1 The importance of sensing the environment

2424

11

StimulusSense organ

Sense

Ear Hearing

11.1 The importance of sensing the environment

b Sound from TV

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11

StimulusSense organ

Sense

Tongue Taste

11.1 The importance of sensing the environment

c Sweetness of hot chocolate

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11

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