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Hearing – How We Hear Sound Introduction Ears are __________________ organs that respond to sound. Your ear converts __________________ waves into nerve impulses that your __________________ interprets. The ear’s structure is designed to __________________ and __________________ the sound waves. Parts of the Ear The OUTER EAR Contains the __________________, ear canal and eardrum The MIDDLE EAR Contains 3 bones: hammer, __________________ and stirrup The INNER EAR Contains the cochlea and __________________ nerve The Outer Ear The ______________ is specially shaped to _______________ and focus sound waves and direct them into the ear. The ear __________________ is a hollow tube that carries the sound waves to the __________________. The sound wave hits the eardrum, causing it to __________________. The eardrum transmits these vibrations into the inner ear where they are ______________. The Middle Ear The middle ear has the __________________ bones in the body: the __________________, anvil and _______________. Their job is to __________________ the vibrations of the eardrum and transmits it into the __________________ear. The stirrup “__________________” on the inner ear at a spot called the __________________ window. The Inner Ear The inner ear has the __________________ which is a __________________-shaped tube that is lined with receptors that respond to sound. The receptors are tiny __________________ cells that shake back and forth in response to sound waves. When they __________________, the hair cells create nerve __________________ which go to the brain along the auditory nerve. High vs. Low Sounds Higher pitch sounds carry __________________ energy and travel further into the cochlea. Lower pitch sounds carry __________________ energy and don’t travel as far into the cochlea. The Auditory Nerve The cochlea sends __________________ signals to the brain through the __________________ nerve, where the brain translates these signal into sound. Any interruption of this process can be a cause for __________________. The Main Ideas The ear is divided into 3 sections: the __________________ ear, middle ear and __________________ ear. At the outer ear, __________________ waves are focused by the pinna down the ear canal to the eardrum. The sound waves make the eardrum __________________. The vibrations are amplified by the _______ middle ear bones: the hammer, anvil and stirrup. The stirrup __________________ the vibrations to the cochlea within the inner ear. The vibrations activate the __________________ cells inside the cochlea, which send __________________ signals to the brain along the auditory nerve. The __________________ interprets these signals as sound.