Oregon Certified Nursing Assistant State Practice Exam

What is the name for the yellowish liquid that plays a role in immunity?

1. Plasma

2. Lymph

3. Serum

4. Urine

The correct answer is: Lymph

The yellowish liquid that plays a significant role in immunity is called lymph. Lymph is a fluid that circulates throughout the lymphatic system, which is a critical component of the immune system. It contains lymphocytes, a type of white blood cell that is essential for the immune response, as well as proteins, nutrients, and waste products. Lymph helps filter out harmful substances and pathogens from the body, transporting them to lymph nodes where they can be eliminated by immune cells. This process is vital for maintaining the body’s defense against infections and diseases. Unlike plasma, which is the liquid component of blood, lymph specifically functions within the lymphatic system and is directly involved in immune functions. While plasma and serum are also bodily fluids, they are not specifically associated with the immune response in the way that lymph is. Plasma is part of the blood that carries cells and nutrients, and serum is the liquid that remains after blood has clotted, lacking the clotting factors found in plasma. Urine, on the other hand, is a waste product filtered by the kidneys and does not play a role in immunity. Understanding the specific function of lymph helps clarify its importance in the immune system.