Question

Neurotransmitters are used by the nervous system to pass messages between neurons during a process called synaptic signaling. These neurotransmitters are released by one cell, cross the synapse of the neuron and bind to an extracellular receptor on the next neuron. Based on the description of a neurotransmitter, which term can best be applied to describe it?

a
Ligand
b
Receptor
c
Synapse
d
Autocrine