unit 1 science 3rd: the human body
TRANSCRIPT
UNIT 1: The
Human Body
PART I: Hearing and Sight
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. Eyebro
w
EyelidEyelash
esPupilIris
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) Brownb) Blue or greenc)Black
c) Black
What colour are the iris?a) Different coloursb) Blue or greenc)Black
• A) Different colours
HEARING
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/Marigallardocapiscol/cienceunit-1-el-cuerpo-humano-espaol