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It is an organ of the lymphatic system located in the left side of the abdominal cavity under the diaphragm, the muscular partition between the abdomen and the chest. In humans, it is about the size of a fist and is well supplied with blood. It filters the blood, stores blood cells, and destroys old blood cells.

In the context of human anatomy, which of the following organs is described above?


1. Heart
2. Pancreas
3. Spleen
4. Bone Marrow

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Correct Answer - Option 3 : Spleen

The correct answer is Spleen.

  • Spleen - 
    • It is an organ of the lymphatic system located in the left side of the abdominal cavity under the diaphragm, the muscular partition between the abdomen and the chest.
    • In humans, it is about the size of a fist and is well supplied with blood.
    • The spleen is encased in a thick connective tissue capsule.
    • As the lymph nodes are filters for the lymphatic circulation, the spleen is the primary filtering element for the blood.
    • Spleen also plays an important role in storing and releasing certain types of immune cells that mediate tissue inflammation.
    • The spleen makes lymphocytes, filters the blood, stores blood cells, and destroys old blood cells. Hence statement 3 is correct.
    • Inside, the mass of splenic tissue is of two types, the red pulp and the white pulp, which do not separate into regions but intermingle and are distributed throughout the spleen.
    • The white pulp is lymphoid tissue that usually surrounds splenic blood vessels.
    • The red pulp is a network of splenic cords (cords of Billroth) and sinusoids (wide vessels) filled with blood, and it is in the red pulp that most of the filtration occurs.
    • It is also known as the graveyard of RBCs (Red Blood Cells) because after completion of lifespan, RBCs are destroyed in the spleen.


  • Lymphatic system - 
    • The lymphatic system is a subsystem of the circulatory system in the vertebrate body that consists of a complex network of vessels, tissues, and organs.
    • The lymphatic system helps maintain fluid balance in the body by collecting excess fluid and particulate matter from tissues and depositing them in the bloodstream.
    • It also helps defend the body against infection by supplying disease-fighting cells called lymphocytes.

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