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The Ear system consists of the outer ear portion that leads from the outside through the ear canal, right up to the Ear drum. This path is lined by hair (cilia) that trap foreign particles and insects. Also, like the nasal path that secretes mucus, this canal also secretes wax to inhibit foreign particles from reaching the ear drum.
The ear system also has an inner portion leading from the ear drum and ending with the Eustachian tubes that open into the throat.
Now, because the ear drum is a curtain that separates the outer ear from the inner ear system, there must be a way that pressure is maintained in balance between the outer and inner ear, or else this would result in problems such as pressure build up, loss of hearing, dizziness and could even lead to related ear infections.
The way this pressure is maintained is through the openings of the ear in the throat which expose the inner ear to the same atmospheric pressure as the outer ear.

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