During a tympanometry, when the tympanic membrane shows resistance to movement, this is known as ________
A) hertz
B) glossectomy
C) impedance
D) a speculum
C
Explanation: A) Hertz measures the frequency of a sound, not movement of the eardrum.
B) Glossectomy is a surgical procedure, not movement of the eardrum.
C) Correct!
D) A speculum is an instrument, not resistance to movement by the eardrum.
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