Which of the following is the main component found in lymph?

• A. Red blood cells
• B. Plasma
• C. Lymphocytes
• D. Platelets

Answer: (C)

Lymph is the fluid that travels through the lymphatic system and carries immune cells. The dominant cellular component in lymph is lymphocytes, the white blood cells that coordinate the immune response (including T cells and B cells). That’s why lymph is rich in these cells, not in red blood cells or platelets, which primarily reside in blood vessels and are involved in clotting, respectively. Plasma is the liquid part of blood with proteins, but in lymph the protein content is much lower and the main cells are lymphocytes. So the presence of these lymphocytes as the main cellular component makes them the correct answer.