10057455
Description
Flashcards by Hamideh Mirzad, updated more than 1 year ago
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Created by Hamideh Mirzad
about 7 years ago
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| Question | Answer |
| Unit 4.4 | Hearing and Seeing |
| wot does energy do in order for us to hear | to hear a sound, its energy needs to be transmitted through your eardrum and delicate structures of the ears. |
| wot happens to the sound waves | your ears collect sound waves as they enter the outer ear and travel through the ear canal. |
| wot does the vibration of the sound wave do | the vibration of the sound wave strikes the eardrum, causing the eardrum to vibrate. |
| where does the vibration then move to? | this vibration is then passed on to the three bones of the middle ear. |
| wot does the movement of the bones cause? | the movement of the bones of the middle ear set up vibrations in the fluid of the cochlea which is located in the inner ear. |
| wot happens in the cochlea | it is in the cochlea that these vibrations are converted into the electrical impulses that your brain interprets as sound. |
| wot r some reasons y ppl can have hearing disabilities | -the ear canal is blocked with wax -the middle ear is filled with fluid -eardrum has been ruptured by a loud noise - sensory cells of the ear have been damaged coz of loud noise -a defect in the auditory nerve or tiny hairs of cochlea prevents sound being transmitted correctly to brain |
| wot has helped ppl with seriously damaged inner-ear to hear | a cochlear implant, a bionic ear |
| structure of human eye | |
| define accommodation | the ability of the lens to change shape |
| wot happens to the accommodation as we get older | the lenses harden |
| wots the scientific word for short-sightedness | myopia |
| wots the scientific word for long-sightedness | hyperopia |
| myopia |
Image:
Myopia (binary/octet-stream)
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| hyperopia |
Image:
Images (binary/octet-stream)
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| wot r bifocals n graded lens used for | used to c if a person has more than one type of vision problem |
| y r they strongest at the bottom? | so if a person looks down through this region to read, and looks straight through the lenses to focus on objects furthur away |
| wot r contact lenses made of | hard plastic, or from water absorbing materials |
| wots another treatment instead of glasses n contact lenses | laser surgery |
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