A. | during the propagation of a nerve impulse, the action potential results from the movement of K ions from extracellular fluid to intracellular fluid |
B. | electrical synapses are very rare in the human system |
C. | receptor sites for neurotransmitters are present on the presynaptic membrane |
D. | when the impulse reaches the presynaptic region, synaptic vesicles break and release neurotransmitters |
E. | impulse through nerve fibers is unidirectional because nerve fibers are insulated by a medullary sheath |