How do hormones primarily function in the body?

Hormones primarily function in the body as chemical messengers. They are produced by glands in the endocrine system and released into the bloodstream, where they travel to various tissues and organs to regulate a multitude of physiological processes. Hormones play crucial roles in everything from metabolism and growth to mood regulation and reproductive functions.

This signaling mechanism allows hormones to communicate changes in the body's internal environment and coordinate responses to maintain homeostasis. For instance, insulin, a hormone produced by the pancreas, effectively lowers blood glucose levels by facilitating glucose uptake in cells, illustrating a specific function of hormones as regulators of bodily functions.

The other options refer to functions that are not primarily linked to hormones. While enzymes catalyze biochemical reactions, structural components provide physical scaffolding for cells and tissues, and energy storage involves fat and carbohydrates. Hormones are distinct in their role as messengers that facilitate communication and coordination within the complex system of the body.