Neurokinin A plays a significant role in the human body as a neurotransmitter and neuromodulator. It is involved in various physiological processes, particularly in the nervous and gastrointestinal systems. In the nervous system, it contributes to the transmission of pain signals and the regulation of mood and stress responses. It is also implicated in inflammatory processes and has been studied for its potential role in conditions like asthma and chronic pain. In the gastrointestinal tract, Neurokinin A influences smooth muscle contraction, which is crucial for the movement of food through the digestive system. It also affects the secretion of digestive enzymes and fluids, aiding in the digestion process. Research is ongoing to explore its potential therapeutic applications, particularly in treating disorders related to its functions, such as irritable bowel syndrome, inflammatory bowel disease, and certain neurological conditions.