Chiropractic Assistant Certification Practice Test

The spleen is recognized as the largest collection of lymphatic tissue in the body. It plays a critical role in the immune system by filtering blood, removing old or damaged red blood cells, and serving as a site for the activation of immune responses. The spleen is made up of two main types of tissue: white pulp, which contains lymphocytes that are involved in immune functions, and red pulp, which helps in filtering blood and recycling iron from red blood cells. Its strategic location and function make it a fundamental aspect of the body's lymphatic system.

While the heart, pancreas, and liver have important roles in the body, they do not function primarily as lymphatic tissues. The heart is a muscular organ that pumps blood, the pancreas is involved in digestion and insulin production, and the liver plays a key role in metabolism and detoxification. None of these organs house significant collections of lymphatic tissue comparable to that found in the spleen.