The primary role of hormones in organisms is to regulate numerous physiological processes and maintain homeostasis. Hormones are chemical messengers produced by endocrine glands that travel through the bloodstream to target organs and tissues. They influence growth, metabolism, reproduction, and mood, among other functions. For example, insulin regulates blood sugar levels, while cortisol helps manage stress responses. By coordinating various bodily functions, hormones allow organisms to adapt to changes and maintain optimal internal conditions for survival and well-being.