The primary role of the nervous system in animals is to coordinate and control bodily functions by transmitting signals between different parts of the body. It processes sensory information, enabling responses to external stimuli, and regulates essential functions, such as movement, reflexes, and vital autonomic processes (e.g., heart rate and digestion). The nervous system also plays a pivotal role in learning, memory, and behavior. Overall, it ensures an organism's adaptation to its environment and survival by maintaining homeostasis and facilitating communication among body systems.