sodium ions out of the cell and potassium ions into the cell

acetylcholine

exocytosis

more rapidly in myelinated than in non-myelinated axons

slightly permeable to sodium ions

includes sensory information, an integrating center, and effectors

sodium-potassium pumps

minimum depolarization needed to operate the voltage-gated sodium and potassium channels

synapse

sustained opening of voltage-gated potassium channels

because the Na+concentration is much higher outside the cell than it is inside, and the Na+ions are attracted to the negatively charged interior