Which one of the following organs can be called a sort of blood bank for human body

Options

A. Heart
B. Liver
C. Spleen
D. Lungs

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which organ in the human body can be referred to as a "blood bank." This implies that the organ in question has a significant role in storing or managing blood.

2. **Identifying the Options**: The options provided are:
- Heart
- Liver
- Spleen
- Lung

3. **Analyzing Each Option**:
- **Heart**: The heart is primarily a pump that circulates blood throughout the body. It does not store blood.
- **Liver**: The liver has many functions, including detoxification and metabolism, but it is not primarily a blood storage organ.
- **Spleen**: The spleen is known for its role in filtering blood and managing red blood cells (RBCs). It removes old or damaged RBCs and plays a role in the immune response.
- **Lung**: The lungs are responsible for gas exchange (oxygen and carbon dioxide) and do not store blood.

4. **Conclusion**: Among the options, the spleen is the organ that acts as a sort of blood bank. It stores blood and is involved in the removal of old RBCs, thus purifying the blood. It also assists in the formation of new blood cells.

5. **Final Answer**: The organ that can be called a sort of blood bank for the human body is the **spleen**.

---