Hormones are best defined as what?

Hormones are best defined as chemical substances produced by the body. This definition highlights their nature as regulatory molecules that are secreted directly into the bloodstream by endocrine glands, such as the pituitary, thyroid, or adrenal glands. Hormones play crucial roles in regulating various physiological processes, including growth, metabolism, and mood. They function as signaling molecules that communicate between different parts of the body to maintain homeostasis and facilitate complex bodily functions.

For instance, insulin, which is a hormone produced by the pancreas, helps regulate blood sugar levels, and thyroid hormones regulate metabolic rate. This broad range of effects underscores the importance of hormones as chemical messengers rather than being merely enzymes, structural components, or nutrients.