Which one of the following human organs is often called the "graveyard" of RBCs'?

The correct option is B Spleen

• Old red blood cells are recycled in the spleen, so it is called "graveyard of RBC".
• The RBCs are mechanically filtered in the red pulp portion of the spleen and after the filtration, the old RBCs are recycled.
• The spleen plays important roles in regard to red blood cells (also referred to as erythrocytes) and the immune system.
• It removes old red blood cells and holds a reserve of blood, which can be valuable in case of hemorrhagic shock, and also recycles iron.

So, the correct answer is option B.