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UNIT 1:
The Human
Body
PART I: Hearing and Sight
• 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.
• 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.
Eyebrow
Eyelid
Eyelashes
PupilIris
External Parts of the Eye
Sweat
Dust
Do you remember?
?
?
? ??
Internal Parts of the Eye
How do we see things?
Light reflects off an object and enters
the eye through the pupil.
Light
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
The retina sends the information to
the brain.
Retina
The brain reads the image and tells us
what we can see.
What colour are the pupils?
a) Brown
b) Blue or green
c)Black
c) Black
What colour are the iris?
a) Different colours
b) Blue or green
c)Black
• A) Different colours
Our ears are the organs of hearing. We
can hear loud or quiet sounds.
Our ears have three parts:
Our ears are very delicate. Earwax is a
sticky substance inside our ear canal. It
protects our ears from infection.
Earwax
What we see
How do we hear things?
Are these ears different from
ours?
Rabbits and other animals have larger
ears to capture better sounds.
Why have we got two ears?
• Some ear slices are from:
http://www.slideshare.net/Marigallardocapisc
ol/cienceunit-1-el-cuerpo-humano-espaol

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UNIT 1 SCIENCE 3rd: THE HUMAN BODY