What is the primary function of the endocrine system?

The primary function of the endocrine system is to regulate various physiological processes within the body through the release of hormones. Hormones are chemical messengers that travel through the bloodstream to target organs and tissues, where they elicit specific responses that help maintain homeostasis. This regulatory function encompasses a wide range of bodily activities, including metabolism, growth and development, reproduction, and response to stress.

For instance, insulin produced by the pancreas regulates blood sugar levels, while thyroid hormones influence metabolic rate. By releasing hormones into the bloodstream, the endocrine system can coordinate complex processes that are crucial for overall health and functioning, making this option the most accurate representation of the endocrine system's primary role.