What does the endocrine system regulate?

• A. Hormones and bodily functions.
• B. Muscle movement.
• C. Digestive enzymes.
• D. Nerve impulses.

Answer: (A)

The endocrine system uses chemical messengers called hormones released by glands to regulate many body processes. These hormones travel through the bloodstream to target tissues and organs, coordinating growth and development, metabolism and energy use, reproduction, and the body’s response to stress. Because hormones can alter multiple systems and often produce longer-lasting effects than nerve signals, this system helps keep internal conditions stable over time.

Muscle movement is mainly controlled by the nervous system and muscles themselves, not primarily by endocrine signaling. Digestive enzymes come from digestive organs like the stomach and pancreas as part of digestion, not as the primary role of the endocrine system. Nerve impulses are signals of the nervous system, guiding rapid responses.