Which statement about lymph is true?

• A. It is a colorless fluid containing white blood cells that drains through the lymphatic system into the bloodstream
• B. It is a red fluid containing red blood cells that circulates in arteries
• C. It is produced in the liver and stored in the spleen
• D. It is a protein-rich fluid within the joints

Answer: (B)

Lymph is a colorless fluid formed from tissue fluid that drains into the lymphatic system and returns to the bloodstream. It contains white blood cells, especially lymphocytes, and plays a key role in immune defense and fluid balance. Lymph travels through lymphatic vessels and ultimately re-enters the blood circulation, usually via the subclavian veins.

This distinguishes it from blood, which is a red fluid circulating in arteries and veins and contains red blood cells. Blood is produced and circulated by the cardiovascular system, not the lymphatic system. Lymph isn’t produced in the liver and isn’t stored in the spleen, and the fluid within joints is synovial fluid, not lymph.