The document discusses the three main parts of the human ear - the outer, middle, and inner ear. The outer ear collects sound waves and directs them through the ear canal to the eardrum. The vibrating eardrum then sends these sound waves through a series of three small bones in the middle ear. These vibrations cause fluid in the coiled inner ear to move, stimulating nerve cells that send sound messages to the brain.

1. Ears

2. We have two ears. Each of our ear has the
same parts. The picture below shows the parts
of the ear. Observe this parts.

3. The three main parts of the ear are the
outer ear, middle ear, and the inner ear.
The outer ear is separated from the middle
ear by a thin membrane called eardrum. The middle
ear is separated from the inner ear also by a
membrane.
The outer ear has a canal. This canal is lined
with wax and tiny hairs. These keep dust from
entering further into your ear. The canal leads to
the middle ear. There are three tiny bones in the
middle ear. In the inner ear there is a coiled tube
called cochlea which contains fluid. The cochlea is
attached to nerve cells.

5. Sound travels like waves. When sound waves
enter the outer ear, they pass through the canal
and strike the eardrum. When the eardrum
moves or vibrates, it moves the tiny bone
nearest to it. This bone, in turn moves the
second bone which in turn, moves the third bone.
The third bone touches the membrane between
the middle ear and the inner ear. When this
membrane vibrates, the fluid in the cochlea
moves. The nerve cells then send the message to
the brain which tells you what you hear.