Understanding Reflex Arc Speed: Key Factors & Spinal Cord Influence
Reflex arc speed depends on:
- Stimulus strength: Stronger stimulus → more sensory neuron firing → faster, stronger motor response.
- Number of synapses: Fewer synapses = faster transmission (less delay). Monosynaptic reflexes (e.g., knee-jerk) are fastest.
- Spinal cord excitability: Higher excitability → faster reflex. Increased by caffeine, strychnine (toxic), electrical stimulation.
Modulating spinal excitability is explored in spinal cord injury and multiple sclerosis rehabilitation.
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