Daily Archives: 19 gener 2016

How our eyes and ears work

How our eyes and ears work

Our brain is the control centre of our body. It reads signals from our eyes and ears and tell us what we can see and hear.

How do we see things?

1. Light reflects off an object and enters the eye through the pupil.

2. The light goes through the lens and makes an image on the retina at the back of the eye. The image is upside down.

3. The retina sends the information to the brain.

4. The brain reads the signals and tells us what we can see.

How do we hear things?

1. Sound waves enter through the outer ear.

2. The waves hit the eardrum in the middle ear and make it vibrate.

3. This makes the liquid in the inner ear move and send signals to the brain.

4. The brain reads the signals and tells us what we can hear.

HEARING

HEARING

Our ears are the organs of hearing. We can hear loud souns and quiet sounds.

Our ears have three parts: the outer ear, the middle ear and the inner ear.

Our ears are very delicate. Earwax is a sticky substance inside our ear canal. It protects our ear from dirt and infection.