👉 The messenger fluid, also known as neurotransmitter, is a critical component in the nervous system responsible for transmitting signals between neurons. Produced by neurons, this fluid contains various chemical messengers, primarily neurotransmitters like dopamine, serotonin, and acetylcholine, which are released into the synaptic cleft when an electrical signal reaches the end of a neuron's axon. These neurotransmitters then bind to specific receptors on the adjacent neuron, either exciting or inhibiting it, thereby facilitating communication and enabling processes such as mood regulation, movement control, and cognitive functions.
