The primary role of hormones in the body is to act as chemical messengers that regulate various physiological processes. Hormones are produced by endocrine glands and released into the bloodstream, where they travel to target organs or tissues to elicit specific responses. They are crucial in regulating functions such as metabolism, growth, reproduction, and homeostasis. For example, insulin controls blood sugar levels, while adrenaline prepares the body for stress. By maintaining balance and responding to internal and external stimuli, hormones ensure that the body functions optimally and adapts to changing conditions.