Question

What is the function of the external ear?

1) To transfer sound waves via vibration of the eardrum
2) To protect the inner ear from foreign objects
3) To regulate the pressure in the middle ear
4) To amplify sound waves

Answer 1

The primary function of the external ear is to collect and focus sound waves into the ear canal towards the eardrum, initiating the process of hearing. It also provides protection for the inner structures of the ear.

Step-by-step explanation:

Function of the External Ear

The function of the external ear includes capturing sound waves and directing them through the ear canal towards the eardrum (tympanic membrane). The air column within the ear canal resonates, partially responsible for the ear's sensitivity to sounds particularly in the 2000 to 5000 Hz frequency range. As sound waves reach the eardrum, they cause it to vibrate, initiating a chain of movements across the middle ear ossicles (malleus, incus, and stapes) which then amplify the sound waves and transmit them to the inner ear via the oval window. This process is crucial for the transduction of sound waves into mechanical vibrations that can be decoded by the brain as sound. Additionally, the external ear also plays a secondary role in protecting the middle and inner ear from foreign objects.

The correct function of the external ear in relation to the options provided to the student is primarily to collect and focus sound waves, which supports the process of hearing.