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The Ear
Descrição
Leaving Certificate Biology Mapa Mental sobre The Ear, criado por Niamh . em 30-03-2017.
Sem etiquetas
the ear
ear
biology
senses
biology
leaving certificate
Mapa Mental por
Niamh .
, atualizado more than 1 year ago
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Menos
Criado por
Niamh .
mais de 7 anos atrás
15
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0
Resumo de Recurso
The Ear
Outer ear
Pinna - visible part of the ear, funnels sound intot he ear canal, made of cartilage
Ear canal - leads to the ear drum
Ear drum - membrane of skin, vibrates when sound hits it
Middle ear
Ossicles (Hammer - mallus, Anvil - incus, Stirrup - stapes
Eustachian tube - keeps pressure equal on both sides of ear drum
Inner ear
Cochlea - fluid filled, coiled, helps with hearing
Semi-circular canals - helps with balance
We hear by...
The pinna channeling the sound to the eardrum
The eardrum vibrates, which then causes the ossicles to vibrate, which amplify the sound by 20 times
The stirrup pushes on the oval window against the cochlea, which moves the lymph inside
Special hairs, which are nerve endings, sense the movement and send messages to the brain along the auditory nerve
The brain interprets these messages as sound
We hear.
We have 3 semi-circular canals so we can have balance in 3 planes
Deafness can be caused by long exposure to high levels of noise, explosions, born with a problem with the cochlea, drugs or ear infections
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