When current is injected into an axon,a. an action potential is evoked before the current has spread any distance from the point of injection.b. the current will spread only in one direction.c. the current will spread passively only if it is a depolarizing current.d. the current will decay exponentially with increasing distance from the injection site (if no action potential is present).e. the current will propagate as an oscillating wave independently of its polarity.

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