Which system provides innate immunity that we are born with?

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

Answer: (B)

Innate immunity are the non-specific defenses you’re born with, forming the body’s immediate line of protection. The skin, as part of the integumentary system, provides this barrier. It acts as a physical shield that blocks most germs from entering. Sweat and oils on the skin also help by creating acidic, hostile environments that deter microbes and by containing antimicrobial substances.

Other systems can influence immunity—hormones from the endocrine system can modulate responses, the nervous system helps coordinate defenses, and the digestive system contains gut immune tissues—but they don’t provide the primary, non-specific barrier you’re born with. That primary barrier is the skin, making the integumentary system the best fit.