A) transmit nutrients.
B) maintain dynamic equilibrium between glial cells and potassium ions.
C) communicate.
D) none of the above.

A) leaves the presynaptic neuron, activates ion channels, and enters the postsynaptic neuron.
B) leaves the presynaptic neuron, activates ion channels, and then is reabsorbed into the presynaptic neuron.
C) leaves the presynaptic neuron, activates ion channels, and then is absorbed into the lymphatic system.
D) leaves the postsynaptic neuron, activates ion channels, and then is absorbed into the presynaptic neuron.

A) the return to baseline voltage that occurs following depolarization.
B) a change in electrical potential that occurs when the cell membrane is stimulated adequately to permit ion exchange between intra- and extracellular spaces.
C) the threshold phenomenon associated with movement in muscle.
D) none of the above.