What does the endocrine system primarily regulate?

The endocrine system primarily regulates hormone secretion that affects various body systems. It plays a crucial role in maintaining homeostasis, which includes regulating metabolism, growth and development, tissue function, and mood, among other processes. Hormones produced by glands such as the pituitary, thyroid, adrenal glands, and pancreas are essential in communicating signals throughout the body, influencing functions in target organs and tissues.

In this context, while other systems play roles in aspects such as food absorption, body temperature regulation, and immune responses, the endocrine system's unique and overarching responsibility is managing the release of hormones that orchestrate these and other physiological processes. This makes the focus on hormone secretion as a primary function distinct and vital for overall bodily regulation.