Retrieved evidence confirms that unmyelinated axons possess specific regulatory mechanisms governing signaling speed (conduction velocity) and associated metabolic costs.
The claim specifies that unmyelinated neurons serve specific functions in signaling speed and metabolic efficiency. Paper 4 details how conduction velocity is regulated in unmyelinated axons via sodium channel dynamics, while Paper 8 discusses metabolic costs and velocity modulation across both myelinated and unmyelinated central axons. Both papers directly support the physiological significance of unmyelinated fibers in speed and metabolism.