Your every thought, memory, and movement begins here: an electric spark turned chemical message, as one neuron whispers to the next. What you’re seeing This animation captures neurotransmission, the process that allows nerve cells to communicate across microscopic gaps called synapses. When an electrical impulse reaches the end of Cell A (the presynaptic neuron), it triggers the release of neurotransmitters—tiny signaling molecules that cross the synaptic cleft and bind to receptors on Cell B (t