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A molecule that carries information across a synaptic cleft is a
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- Which of the following explains the unidirectional propagation of action potentials?a. The voltage dependence of the sodium channelsb. The voltage dependence of the potassium channelsc. The presence of a refractory period at a location where an action potential has just passedd. Sufficient "leakiness" of the axons, such that backward propagation of action potentials is preventede. The polarized orientation of microtubules within the axon
- 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.
- The _______ most directly affects the rate of information processing within the central nervous system.a. number of sodium channels along an axonb. number of potassium channels along an axonc. propagation speed of action potentialsd. threshold voltage of neuronse. ratio of sodium to potassium channels