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← Human Body & HealthWhy does a slowly applied pressure sometimes fail to trigger a touch sensation, even if the same total force, if applied quickly, would be easily detected?
A)Muscle fatigue desensitizes local nerves
B)Sensory adaptation reduces signal transduction
C)Mechanoreceptor firing adapts over time✓
D)Descending pathways actively inhibit slow inputs
💡 Explanation
Mechanoreceptors exhibit adaptation, decreasing their firing rate under sustained stimulation, because the ion channels mediating depolarization gradually inactivate or desensitize. Therefore, a slow pressure may not reach the threshold for sustained sensation, rather than muscles being involved or complete signal blockage through inhibition.
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