PSI Barbering Practice Exam

Which organ is responsible for filtering blood in the lymphatic system?

1. Liver

2. Heart

3. Spleen

4. Kidneys

The correct answer is: Spleen

The spleen is the organ responsible for filtering blood in the lymphatic system. It plays a vital role in the immune response by recognizing and removing old or damaged red blood cells and pathogens from the bloodstream. The spleen contains specialized immune cells that help to identify and combat harmful microorganisms, contributing to the body's defense system. In addition, the spleen acts as a reservoir for blood and can release additional red blood cells into circulation when needed, helping to maintain proper blood volume and response during physical activity or trauma. This filtering function and the role in immune surveillance highlight the spleen's significance in both the circulatory and lymphatic systems. While the liver also filters blood, it primarily processes nutrients and detoxifies substances rather than serving a direct role in the lymphatic system. The heart is responsible for circulating blood, and the kidneys filter waste products from the blood to form urine, but they are not directly involved in the lymphatic system's filtering functions. Therefore, the spleen is the correct answer in this context.