home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
ftptest.leeds.ac.uk
/
2015.02.ftptest.leeds.ac.uk.tar
/
ftptest.leeds.ac.uk
/
bionet
/
mcq_etc
/
phys_mcq.exe
/
HEARING.MCQ
< prev
next >
Wrap
Text File
|
1993-08-06
|
4KB
|
143 lines
D:Created 14.46 06/08/1993
D:Subject : Physiology
D:Topic : Hearing
D:Level : Moderate
D:
D:Authors : Department of Physiology
D: The University
D: Leeds LS2 9NQ
I:MCQ SB 1
G:3
G:1:Dental Students
Q:1,2,3,4,5
G:2:Medical Students
Q:1,2,3,4,5
G:3:Science Students
Q:1,2,3,4,5
T:A
L:2
#:1
G: 10464 1 2 3
S:1
:In the auditory system:
B:N:5
B:1:T:1
:sound frequency is perceived as pitch
B:2:T:1
:sound amplitude is perceived as loudness
B:3:T:2
:a pure tone produces optimal activation of hair cells at one site
: on the basilar membrane
B:4:F:1
:sound waves normally enter the cochlea at the round window
B:5:T:2
:sound information from each cochlea is carried to auditory
: receiving areas in both temporal lobes
F:8
:The "place theory" of hearing states that the pitch of sound depends
:on the site on the basilar membrane which vibrates maximally during
:presentation of a pure tone. The perceived volume depends on the
:amplitude of vibration of the basilar membrane during the standing wave
:produced by that tone. Cortical deafness is rare because the auditory
:pathways are represented bilaterally in the brainstem, lateral
:lemniscal nuclei, medial geniculate bodies and superior temporal gyri.
:Sound waves enter the cochlea at the oval window.
E:------
#:2
G: 10464 1 2 3
S:1
:In the cochlea:
B:N:5
B:1:T:2
:the scala tympani and the scala vestibuli are connected at the
: helicotrema
B:2:T:1
:the scala media contains endolymph
B:3:F:1
:perilymph contains a high concentration of potassium ions
B:4:T:1
:the stria vascularis secretes endolymph
B:5:T:2
:the hair cells of the cochlea make contact with the tectorial
: membrane
F:7
:Endolymph is secreted by the stria vascularis of the scala media and
:contains a high concentration of potassium ions. The hair cells of the
:basilar membrane have cilia, the largest component of which is the
:kinocilium which bends during shearing movements of the basilar and
:tectorial membranes. These structures are bathed in endolymph. The
:perilymph of the scala tympani can flow into the scala vestibuli at the
:helicotrema.
E:------
#:3
G: 10464 1 2 3
S:2
:Which of the following statements about the hair cells of the
:cochlea is true?
B:N:5
B:1:F:1
:They protect the lower airways from large particulate matter
B:2:F:1
:They support the basilar membrane
B:3:F:2
:They are connected by neural pathways to the lateral geniculate
: body
B:4:T:1
:They are contained in the macula
B:5:F:1
:They are vestigial organs without function
F:5
:The cochlear hair cells are the functioning auditory receptors.
:Neural pathways from the hair cells pass to the inferior colliculi and
:the medial geniculate body before synapsing in the auditory cortex.
:The hair cells are contained in the macula (otolithic organ) and are
:overlaid by the otolithic membrane.
E:------
#:4
G: 10464 1 2 3
S:2
:In humans, pitch perception by the cochlea is believed to be
:owing to the ability of the central nervous system to identify the:
B:N:5
B:1:F:1
:area of tectorial membrane stimulated
B:2:T:1
:area of basilar membrane stimulated
B:3:F:1
:rate of oscillation of the tectorial membrane
B:4:F:1
:rate of oscillation of the basilar membrane
B:5:F:1
:rate of vibration of the otoliths
F:8
:The "place principle" of pitch determination states that the basilar
:membrane is differentially innervated so that the portion near the apex
:of the cochlea is maximally stimulated by low-pitched sounds and the
:portion near the base of the cochlea is maximally stimulated by high-
:pitched sounds. Fibres from the various areas of the membrane end in
:separate portions of the cochlear nuclei. The nervous system thus
:"hears" pitch by determining the positions along the basilar membrane
:that are being stimulated.
E:------
#:5
G: 10464 1 2 3
S:1
:Sound waves:
B:N:5
B:1:T:1
:are amplified by the ossicles of the middle ear
B:2:F:1
:enter the cochlea via the helicotrema
B:3:T:2
:cause maximal oscillations at specific points on the basilar
:membrane according to their pitch
B:4:F:2
:cause the hair cells of the Organ of Corti to shear against Reisner's
:membrane
B:5:F:1
:are most easily heard at a frequency of 6000 Hz
F:1
:No explanation available.
E:------
::