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

Question

Quizplus · Accepted Answer

The arrival of an action potential at the axon terminal of the first neuron signals the release of neurotransmitters into the extracellular fluid, which then binds to receptors on the second neuron, initiating the process of neuronal communication. Option A is incorrect because the synthesis of neurotransmitters occurs in the cell body of the neuron, not in the axon terminal. Option B is incorrect because neurotransmitters are released from the axon terminal, not taken up from the extracellular space. Option C is incorrect because enzymatic breakdown of residual neurotransmitters occurs in the extracellular fluid, which does not involve the arrival of an action potential at the axon terminal.

Neuronal Communication Is a Two-Step Process