Which system regulates bodily functions through hormones?

The endocrine system is responsible for regulating bodily functions through the secretion of hormones. Hormones are chemical messengers produced by glands in the endocrine system and are released into the bloodstream, influencing various physiological processes throughout the body, including growth and development, metabolism, immune function, and mood regulation.

The nervous system, while also critical for bodily functions, primarily uses electrical signals for rapid communication and responses but does not rely on hormones to achieve its effects. The immune system is focused on defending the body against pathogens and does not regulate bodily functions in the hormonal sense. The muscular system is involved in movement and locomotion but does not play a direct role in hormonal regulation.

Overall, the endocrine system facilitates longer-term changes and regulates ongoing processes in the body, which is distinct from the more immediate and short-term responses managed by other systems.