Which is TRUE about the axon hillock of an axon?
a. It contains abundant voltage-gated ion channels.
b. Synapses far from the axon hillock are more effective in influencing whether an action potential will be generated in the axon than are synapses close to the axon hillock.
c. It can only conduct graded potentials because it lacks voltage-gated Na channels.
d. It is the region where neurotransmitter vesicles are docked and ready to be released by exocytosis.