Chemical signals are molecules that transmit information between cells, tissues, or organisms. They play a crucial role in various biological processes, including communication within the nervous system and the regulation of bodily functions. Examples of chemical signals include hormones, neurotransmitters, and pheromones, which can influence behavior, growth, and metabolism. In the human body, hormones like insulin and adrenaline act as chemical signals that help regulate processes such as blood sugar levels and the fight-or-flight response. Similarly, neurotransmitters like serotonin and dopamine facilitate communication between nerve cells, affecting mood and behavior. These signals are essential for maintaining homeostasis and coordinating responses to environmental changes.