Statement I: The spleen is a large organ, shaped like a bean and mainly contains lymphocytes and phagocytes.

Statement II: The spleen functions as a blood filter, capturing microorganisms present in the blood. Additionally, the spleen serves as a reservoir for red blood cells.

Both statement I and statement II are correct .

 The correct answer is Option (3) – Both statement I and statement II are correct .

I. The spleen is an important organ located in the upper left side of the abdomen. It is responsible for filtering the blood and playing a crucial role in the immune system. The spleen contains different types of immune cells, including lymphocytes (such as B cells and T cells) and phagocytes (such as macrophages). Lymphocytes are involved in immune responses, while phagocytes are responsible for engulfing and destroying pathogens.

II. The spleen acts as a filter for the blood circulating through the body. It traps and removes microorganisms, such as bacteria or viruses, that may be present in the bloodstream. This filtering function helps in preventing infections and maintaining overall immune health. Additionally, the spleen serves as a reservoir for red blood cells. It can release stored red blood cells into circulation when there is a need for increased oxygen-carrying capacity, such as during times of physical exertion or blood loss.

In summary, the spleen is an organ that contains lymphocytes and phagocytes, contributing to the body's immune defense. It acts as a filter for blood-borne microorganisms and also serves as a reservoir for red blood cells. Its functions are essential for maintaining a healthy immune system and proper blood circulation.