## Step1

Hearing

Study the text and do the assignment below:

The parts and their functions in the order the information about sound travels through: Pinna - Acts as a kind of funnel which assists in directing the sound into the auditory canal. Auditory canal - Transmits sound from the pinna to the eardrum. Eardrum - A membrane at the end of the auditory canal. Its is extremely sensitive and pressure from sound waves makes the eardrum vibrate. Hammer - First of three bones in the middle ear. The bones in the middle ear amplify the sound. Anvil - Second of three bones in the middle ear. The bones in the middle ear amplify the sound. Stirrup - Third of three bones in the middle ear. The bones in the middle ear amplify the sound. Oval window - This membrane recieves vibrations from the stirrup and covers the entrance to the cochlea. The oval window makes the fluid in the cochlea move. Cochlea - Transforms sound waves into electrial impulses which are sent to the brain through the auditory nerve. Auditory nerve - A bundle of nerve fibres that carry information between the cochlea and the brain. Organs of balance - Has no function in hearing. These organs make sure we are able to keep balance. Eustachian tube - Has no function in hearing. Makes sure the pressure on the outside of the eardrum stays the same as the pressure on the inside.

Do you now the parts of the ear? Test your knowledge with the assignment below: