ASLP 3030 Final UPDATED Exam Questions and CORRECT Answers

ASLP 3030 Final UPDATED Exam
Questions and CORRECT Answers
Two aspects of hearing considered - CORRECT ANSWER - - anatomy and physiology of
hearing organs
- perception of sound


Outer ear - CORRECT ANSWER - - auricle/pinna
- external auditory meatus (canal)


Acoustic resonator - CORRECT ANSWER - - formed by the ear canal and external ear
- sound waves with frequencies corresponding with resonant frequency will have greater
amplitudes of vibration


Resonant frequency - CORRECT ANSWER - - approximately 3500 Hz



Middle ear - CORRECT ANSWER - - auditory ossicles
- malleus
- stapes
- incus
- malleus attaches to TM
- converts acoustic energy to mechanical energy


Impedance mismatch - CORRECT ANSWER - 10log (.001)= 30 dB
- loss of 30 dB


Why do we need a middle ear? - CORRECT ANSWER - - we would lose 30 dB of sound
energy

, - ME acts as transformer and increases sound pressure by slightly more than 30 dB, recovering
all that would have been lost in the air-fluid barrier


How does the transformer work? - CORRECT ANSWER - - areal mechanism
- ossicular level
- membrane buckling


3 principles to overcome impedance mismatch - CORRECT ANSWER - - area ratio
- curvature of the TM
- lever action


Impedance matching - CORRECT ANSWER - - accomplished in the middle ear by
increasing the pressure fo the incoming stimulus


Area ratio - CORRECT ANSWER - - force focused on small area results in a high
pressure
- pressure= force/area


Curvature of TM - CORRECT ANSWER - - adds 6.0 dB



Lever action - CORRECT ANSWER - - length of manubrium and neck of malleus is
longer than the long process of the incus
- 1:3:1 pressure change
- 2.2 dB


Inner ear - CORRECT ANSWER - - cochlea
- vestibule
- semicircular canals