Which statement best describes the function of the endocrine system?

• A. Regulates body processes through hormones
• B. Filters toxins from the blood
• C. Produces digestive enzymes
• D. Creates new skin cells

Answer: (A)

The function of the endocrine system is to regulate body processes through hormones. Hormones are chemical messengers released into the bloodstream by glands such as the pituitary, thyroid, adrenal, pancreas, and gonads. They travel to target tissues and organs to adjust activities like metabolism, growth and development, reproduction, and responses to stress. Because hormonal signaling tends to be slower to start but longer lasting than nerve signaling, the endocrine system provides sustained regulation that helps maintain overall balance in the body.

For example, insulin from the pancreas helps control blood sugar, thyroid hormones set the body's metabolic rate, and cortisol helps mobilize energy during stress. This contrasts with the other options: filtering toxins from the blood is the job of the liver and kidneys (excretory systems), producing digestive enzymes is a function of the digestive system (the pancreas does have a digestive enzyme role, but that’s the exocrine function, not the endocrine system’s general role), and creating new skin cells relates to skin biology and regeneration rather than hormonal signaling.