Which body system regulates hormonal activity via glands?

• A. Nervous system
• B. Digestive system
• C. Endocrine system
• D. Circulatory system

Answer: (C)

Hormonal activity is regulated by glands that make up the endocrine system. Glands such as the pituitary, thyroid, adrenal, and pancreas secrete hormones into the bloodstream, and these chemical messengers travel to target organs to control metabolism, growth, reproduction, and stress responses. This direct gland-based signaling is what defines the endocrine system. The nervous system can influence when hormones are released, but it is the endocrine system that provides the hormonal regulation through glands. The digestive system and circulatory system don’t regulate hormonal activity via glands—the digestive system handles nutrient processing, while the circulatory system simply transports hormones to their targets.