What is the main function of myelin in a nerve fibre?
Correct answer: B. To increase the speed of impulse conduction
- A. To produce neurotransmitters at the cell body
- B. To increase the speed of impulse conduction
- C. To detect chemicals at a sensory receptor
- D. To connect the spinal cord with skeletal muscle
Explanation
Myelin electrically insulates the axon and allows the impulse to jump between nodes of Ranvier, greatly increasing conduction speed. It does not form neurotransmitters or act as a sensory receptor.
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About Nervous System and Special Senses
The nervous system covers neurons, neuroglia, nerve impulses, synapses, reflex arcs, and the organization of the central and peripheral nervous systems. It also explains the autonomic divisions and the receptors and pathways for vision, hearing, balance, taste and smell, distinguishing sensory reception from conscious perception.
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