BRAIN
SPINAL CORD
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Type A fibers-large diameter + myelinated
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Type B fibers-smaller diameter + myelinated
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Type C fibers-Smaller unmyelinated fibers
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Type D fibers-larger unmyelinated fibers
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Detailed explanation-1: -The fastest signals in our bodies are sent by larger, myelinated axons found in neurons that transmit the sense of touch or proprioception – 80-120 m/s (179-268 miles per hour).
Detailed explanation-2: -Based on experiments conducted in 1966, our fastest nerve impulses can travel up to 288 km/h (180 mph), though these slow as we age. The speed of nerve impulses varies enormously in different types of neuron.
Detailed explanation-3: -The fastest conduction velocity occurs in the largest diameter nerve fibres. This phenomenon has formed the basis for classifying mammalian nerve fibres into groups in order of decreasing diameter and decreasing conduction velocity. Another factor is the temperature of the nerve fibre.