Question

RBCs are destroyed in ____.

• A. Kidneys
• B. Pancreas
• C. Spleen
• D. Liver

Hint:

Spleen is called: \[ \text{``Graveyard of RBCs''} \] because it destroys old red blood cells.

Answer 1

The Correct Option is C

Concept:
Red Blood Cells (RBCs) carry oxygen in blood using haemoglobin. Average lifespan of RBCs: \[ 120 \text{ days} \] Old and damaged RBCs are mainly destroyed in: \[ \boxed{\text{Spleen}} \] Hence, spleen is often called: \[ \text{``Graveyard of RBCs''} \]

Step 1: Understand RBC destruction.
After completing lifespan:
• RBCs become weak
• Spleen filters them
• Macrophages destroy them

Step 2: Understand role of spleen.
Functions of spleen:
• Destruction of old RBCs
• Blood filtration
• Immunity support

Step 3: Analyze options carefully.
Option (A): Kidneys
Involved in urine formation. Incorrect. Option (B): Pancreas
Digestive and endocrine gland. Incorrect. Option (C): Spleen
Main site of RBC destruction. Correct. Option (D): Liver
Liver also helps slightly, but spleen is the primary answer. Incorrect.

Step 4: Choose the correct answer.
Therefore, RBCs are mainly destroyed in: \[ \boxed{\text{Spleen}} \] Hence, \[ \boxed{(3)\ \text{Spleen}} \]