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Animals have evolved different mechanisms to increase the propagation speed of the action potential along their axons. Such conduction velocity is important because it limits how fast the animal can react to positive and negative stimuli in the rapidly changing world.

From the following statements select the correct mechanisms that animals use to increase conduction velocity along their axons.

Select ALL that apply.


Invertebrates like the squid increase the axonal diameter to decrease the internal resistance of current flow.


Invertebrates myelinate their axons to decrease the internal resistance of current flow.


Vertebrates myelinate their axons, so less current leaks out of the axon and a given current can flow farther.


Vertebrates increase their body temperature to increase the conduction velocity of the action potential.

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