Neuronal Communication Is a Two-Step Process

Multiple Choice

Neuronal communication is a two-step process.In the second step,which takes place between two neurons,what does the arrival of an action potential at the axon terminal of the first neuron signal?

A) The synthesis of neurotransmitters by specialized enzymes
B) The uptake of neurotransmitters from the extracellular space
C) The enzymatic breakdown of residual neurotransmitters
D) The release of neurotransmitters into the extracellular fluid