Biology • Science • Medicine on Instagram: "Neurons are the fundamental units of the nervous system, and synapses are the precise junctions that allow them to communicate. This illustration shows how electrical and chemical signals pass between neurons through a synapse. When a neuron fires, an electrical impulse travels down its axon and reaches the synapse. At this junction, the signal is converted into a chemical message using neurotransmitters, which cross the tiny synaptic gap and bind to r