👉 A neurotransmitter is a chemical messenger in the nervous system that plays a crucial role in transmitting signals between neurons. They are essential for communication between nerve cells, which enables the exchange of information and energy. Transmitters can be classified into four main types: 1. Acetylcholine (ACh): This type of neurotransmitter is the most abundant and has a significant effect on muscle function. 2. GABA (gamma-aminobutyric acid): A neurotransmitter that acts as an inhib
