Question

Which of the following organs is the blood bank?
A. Heart
B. Lungs
C. Spleen
D. Liver

Answer 1

Hint: Spleen is an essential organ of the lymphatic system present in all vertebrates. It is known as blood filters.

Complete answer: Human spleen is located in the upper left abdomen, behind the stomach. The spleen acts as a filter for blood as part of the immune system.
Old red blood cells are recycled in the spleen, and platelets and white blood cells are stored there. The spleen plays important roles in regard to red blood cells (erythrocytes) and the immune system. The spleen removes old red blood cells and holds a reserve of blood, which can be valuable in case of hemorrhagic shock, and also recycles iron.

As a part of the mononuclear phagocyte system, the spleen metabolizes hemoglobin removed from senescent red blood cells (erythrocytes).
The globin portion of hemoglobin is degraded to its constitutive amino acids by the spleen, and the heme portion is metabolized to bilirubin, which is removed in the liver.
The spleen helps to fight certain kinds of bacteria that cause pneumonia and meningitis.

Additional information: Heart is an essential organ that pumps blood throughout the body via the circulatory system. The heart supplies oxygen and nutrients to the tissues and removes carbon dioxide and other wastes.
Lungs are important as it helps in respiration.
In respiration, oxygen from incoming air enters the blood, and carbon dioxide leaves the blood, and the process is done with the help of the lungs.
The liver helps in the production of bile and excretion.
So, the correct answer is C. Spleen acts as the organ that is the blood bank.

Note: Spleen is known as the graveyard of the cell as it ruptures old RBC.