The invertebrates usually have a double ventral nerve cord while the vertebrates have a single dorsal nerve cord. The separation of the two different kinds of ions by the neuron s cell membrane. Because there are more positive ions on the outside than the inside G. a resting potential is the ability to do work while an action potential is the actual work H. potassium I. because it progresses from one end of the neuron toward the other J. a wave or repolarization K. the sodium-potassium pump 25. A. from dendrites toward the terminal branches B. Because only the terminal branches have the sacs of acetylcholine which travels across the synapse. The dendrites don't. Motor neurons carry an impulse from the CNS to an effector.
Association neurons connect the previous two types of neurons.