The human ear

Sound waves are collected in the outer ear and is passed to the ear drum. It vilibrates by alternating compression and rarefaction of the air. The vibrations pass by the ossicles to magnify the force of the vibrations. Cilia cells of different lengths in the cochlea detect different frequencies which send electrical impulses to the brain. Cilia that detect high frequencies are closest to the outside of the cochlea so it has the least protection. Hearing lost is usually cause by high frequencies in older people and loud noises in younger ones