AP BIOLOGY

Detailed explanation-1: -The cochlea is filled with a fluid that moves in response to the vibrations from the oval window. As the fluid moves, 25, 000 nerve endings are set into motion. These nerve endings transform the vibrations into electrical impulses that then travel along the eighth cranial nerve (auditory nerve) to the brain.

Detailed explanation-2: -The mechanical vibrations of the stapes footplate at the oval window creates pressure waves in the perilymph of the scala vestibuli of the cochlea. These waves move around the tip of the cochlea through the helicotrema into the scala tympani and dissipate as they hit the round window.

Detailed explanation-3: -Sound waves entering the ear travel through the external auditory canal before striking the eardrum and causing it to vibrate. The eardrum is connected to the malleus, one of three small bones of the middle ear. Also called the hammer, it transmits sound vibrations to the incus, which passes them to the stapes.

Detailed explanation-4: -The eardrum vibrates. The vibrations are then passed to 3 tiny bones in the middle ear called the ossicles. The ossicles amplify the sound. They send the sound waves to the inner ear and into the fluid-filled hearing organ (cochlea).

Detailed explanation-5: -The mechanical vibrations from the stirrup acting on the oval window sets up traveling sound waves in the fluid of the cochlea or inner ear.