UNIT 1 SCIENCE 3rd: THE HUMAN BODY
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Transcript of UNIT 1 SCIENCE 3rd: THE HUMAN BODY
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UNIT 1: The
Human Body
PART I: Hearing and Sight
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SIGHT
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• Our eyes are the organs of sight. We can see different shapes, sizes and colours.
• The pupil is black but the iris can be of different colours.
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• Our eyes are very delicate and are protected by the eyebrows, the eyelashes and the eyelids. These stop sweat and dust getting into our eyes. Eyebro
w
EyelidEyelash
esPupilIris
External Parts of the Eye
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Sweat
Dust
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Do you remember?
??
? ??
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Internal Parts of the Eye
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How do we see things?
Light reflects off an object and enters the eye through the pupil.
Light
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The light goes through the eye and makes an image on the retina at the back of the eye. The image is
upside down.
Retina
Upside down
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The retina sends the information to the brain.
Retina
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The brain reads the image and tells us what we can see.
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What colour are the pupils?a) Brownb) Blue or greenc)Black
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c) Black
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What colour are the iris?a) Different coloursb) Blue or greenc)Black
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• A) Different colours
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HEARING
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Our ears are the organs of hearing. We can hear loud or quiet sounds.
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Our ears have three parts:
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Our ears are very delicate. Earwax is a sticky substance inside our ear canal. It protects our
ears from infection.
Earwax
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What we see
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How do we hear things?
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Are these ears different from ours?
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Rabbits and other animals have larger ears to capture better sounds.
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Why have we got two ears?
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• Some ear slices are from: http://www.slideshare.net/Marigallardocapiscol/cienceunit-1-el-cuerpo-humano-espaol