10
How do we see and hear?
Our bodies and health
Our eyes and ears detect information about objects and sounds around us.
They send messages to the brain, and our brain interprets the information.
So we see and hear when our eyes and ears transmit information to the brain.
1
Look at your classmates’ eyes. What colour are they? Make a bar chart to show your results.
… people in the class have blue/brown/green/grey eyes.
G
E T T I N G S T A R T E D
How do we see?
1.
Light goes into the
eye through the pupil.
Then it passes through
the lens.
2.
The lens projects an upside
down image onto the retina.
This information is sent
to the optic nerve.
The
iris
is the coloured part of the eye. It surrounds the pupil. It’s
made of very small muscles that open and close the pupil.
The
pupil
is a small hole
that lets light into the eye.
The
cornea
covers
and protects the
iris and the pupil.
The
lens
is a transparent,
oval-shaped structure that
focuses light onto the
retina. It’s located behind
the pupil and the iris.
The
retina
is made of nervous
tissue arranged in thin layers
of cells that detect light and
colours.They send information
to the optic nerve.
The
optic nerve
is connected
to the brain. It transmits
information from the retina.
3.
The optic nerve transmits
the information to the brain.
