Derek Has Been Asked to Hand-Deliver a Message to Adeline

Multiple Choice

Derek has been asked to hand-deliver a message to Adeline. Adeline lives across the river from Derek, and there is no bridge. Therefore, Derek must take a boat across the channel to deliver the message. If we compare Derek's actions to those that occur in neurons, we can say that Derek, the person who carries the message across the channel, is like a

A) vesicle.
B) neurotransmitter.
C) synapse.
D) receptor site.