The system of hormones that helps to control bodily functioning is called the ____________ system.

• A. Endocrine
• B. Nervous
• C. Immune
• D. Digestive

Answer: (A)

The main idea being tested is how the body uses chemical messengers to regulate functions. Hormones are these messengers released by glands into the bloodstream, traveling to distant target organs to influence metabolism, growth, reproduction, and responses to stress. This slow, widespread signaling is what the endocrine system does, making it the best fit for “a system of hormones that helps to control bodily functioning.” The nervous system, by contrast, uses fast electrical signals for quick, localized actions; the immune and digestive systems have different primary roles, such as defending the body or breaking down food. So the endocrine system is the one that matches the description.