High- and low-frequency sounds are discriminated chiefly by
a. low frequencies producing stronger vibrations
b. high frequencies producing larger action potentials
c. the middle ear bones vibrating more vigorously for low frequencies
d. low frequencies deflecting the basilar membrane at a greater distance from the oval window
e. low frequencies setting up fluid vibrations in the perilymph
D
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Some antacid drugs block histamine receptors, resulting in reduction of the production and excretion of stomach acid. These drugs have the biggest effect on which of the following?
A) surface epithelial cells B) chief cells C) mucous neck cells D) parietal cells
In a graph of wave summation, the tension level returns to baseline between each peak of force.
Answer the following statement true (T) or false (F)
A positive Romberg test occurs when
A. a person develops nystagmus. B. a person becomes unsteady while standing with feet together and eyes closed. C. a person is unsteady while standing with feet together and eyes open. D. a person remains steady when balancing on one foot with eyes open. E. a person is unsteady when balancing on one foot with eyes open.
In this illustration of the inner ear, what feature does the number 9 indicate?
A. Membranous labyrinth B. Spiral organ C. Apex of cochlea D. Perilymph E. Endolymph