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← Human Body & HealthA construction worker using a jackhammer experiences decreased tactile sensitivity in their hands. Which failure mode becomes likely when prolonged vibration exposure exceeds mechanoreceptor adaptation limits?
A)Increased sympathetic nervous system activity
B)Elevated endorphin production desensitization
C)Enhanced Ruffini ending firing rate
D)Impaired two-point discrimination ability✓
💡 Explanation
Prolonged vibration leads to desensitization of mechanoreceptors because the constant stimulation exceeds adaptation capabilities, therefore impairing the ability to distinguish between closely spaced points. Rather than sympathetic activation or enhanced Ruffini firing, the adaptation limits are exceeded.
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