Introduction to psychology

Which is the best explanation of how a nerve impulse is carried from one neuron to another? The action potential or impulse

	jumps the synapse similar to the way a spark jumps the gap in a sparkplug.
	causes the axon terminal to squirt out a chemical toward the next neuron.
	causes the axon terminal to expand and touch a receptor site.
	bursts open a gap in the wall of the next neuron's dendrite.

	absorbing neural impulses.
	imitating or canceling the effects of neurotransmitters.
	changing the sodium balance in the synapse.
	duplicating the effect of potassium in the nuclei.

	nerve cells are continuously active.
	action potentials occur completely or not at all.
	an electrical current crosses the synapse completely or not at all.
	all the neurons in a particular "lobe" of the brain fire or none of them fire.