Which system regulates body functions through hormone secretion?

The endocrine system is the body system responsible for regulating various functions through the secretion of hormones. Hormones are chemical messengers that are produced by glands in the endocrine system and released into the bloodstream to target organs and tissues, where they exert their effects. This system plays a crucial role in maintaining homeostasis, influencing growth and development, regulating metabolism, and managing stress responses, among other functions.

In contrast, the muscular system is primarily responsible for movement and posture, achieved through muscle contractions. The nervous system controls body functions by transmitting signals between different parts of the body, mainly through electrical impulses. While it does play a key role in communication and coordination, it does not primarily regulate functions through hormones. The integumentary system, which includes the skin, hair, and nails, serves protective functions and helps in regulating temperature but is not involved in hormonal regulation. Each of these systems has distinctive roles, but the endocrine system specifically focuses on hormonal control throughout the body.