Why is it important that each pair of semicircular canals produce reciprocal signals?
A. The canals never produce reciprocal signals.
B. Difficulties with control of posture, abnormal eye movements, and nausea will result if the signals are not reciprocal.
C. Difficulties in sensing forward motion will result if the signals are not reciprocal.
D. Difficulties in sensing up and down motion will result if the signals are not reciprocal.
ANS: B
Rationale: Each of the canals in a pair produces reciprocal signals; that is, increased signals from one canal simultaneously occur with decreased signals from its partner. These reciprocal signals are essential for normal vestibular function. If the signals from a pair of semicircular canals are not reciprocal, difficulties with control of posture, abnormal eye movements, and nausea result. The maculae, not the semicircular canals, sense forward motion.
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