Which system helps defend against invading microorganisms and also absorbs fat from the digestive system?

• A. Endocrine System
• B. Nervous System
• C. Lymphatic System
• D. Skeletal System

Answer: (C)

The lymphatic system handles both immune defense and fat absorption. It defends against invading microorganisms through its immune tissues: lymph nodes filter lymph and trap pathogens, while lymphocytes (T and B cells) detect and attack invaders; organs like the spleen and thymus coordinate these responses. It also absorbs fats from the digestive system via specialized vessels called lacteals in the lining of the small intestine. Fats enter these lacteals as chyle and are carried through the lymphatic system, eventually joining the bloodstream via the thoracic duct. This dual role—immune protection and lipid transport—distinguishes the lymphatic system from the other options.