Which axon transmits the action potential more rapidly?
Correct answer: D. 2mm diameter neuron with myelin
- A. 1mm diameter neuron, lacking myelin
- B. 1mm diameter neuron, with myelin
- C. 2mm diameter neuron, lacking myelin
- D. 2mm diameter neuron with myelin
Explanation
The action potential is an electric impulse, and the speed of a nerve impulse is directly related to its diameter. As the diameter is greater, 2mm, nerve impulse transmission is faster. In addition, conduction in myelinated neurons is more rapid because it jumps from node to node. Resultantly, a 2mm diameter neuron with a myelin sheath will conduct impulses more quickly. Hence, option D is the correct option.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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