What is a major function of the endocrine system?

The major function of the endocrine system is to produce and secrete hormones, which are chemical messengers that play critical roles in regulating various bodily functions. Hormones travel through the bloodstream to target organs and tissues, where they dictate processes such as metabolism, growth, reproduction, and homeostatic balance.

The significance of hormone regulation extends to numerous physiological processes, including stress responses, immune system function, and mood regulation. This system operates through a series of glands, such as the pituitary, thyroid, and adrenal glands, all of which contribute to overall body regulation through hormonal signaling.

While digestion, blood filtration, and muscle movement are important physiological functions, they are primarily governed by other systems—in particular, the digestive system, renal system, and muscular system, respectively. The endocrine system's unique role in hormone production and secretion distinctly defines its primary purpose in human biology.