What is the main function of the spleen in the body?

The primary function of the spleen is to filter blood, which is vital for maintaining the body’s overall health and immune response. The spleen performs this function by removing old or damaged red blood cells from circulation, as well as filtering out pathogens and debris from the blood. It also plays an important role in the immune system by producing lymphocytes, which help the body mount an immune response against infections.

In addition to its role in filtering blood, the spleen can store a reserve of blood, including platelets, which can be released into circulation when needed, particularly during times of injury or hemorrhage. This process is essential for helping to maintain proper blood volume and pressure.

Understanding the central role that the spleen plays in both blood filtration and immune function underscores its importance to human health, confirming that filtering blood is indeed its main function.