The life span of the erythrocytes in humans is about

Options

A. 120 days
B. 150 days
C. 190 days
D. 180 days

Answer

**Step-by-Step Solution:**

1. **Understanding Erythrocytes**: Erythrocytes, commonly known as red blood cells (RBCs), are crucial components of blood responsible for transporting oxygen throughout the body.

2. **Lifespan of Erythrocytes**: The lifespan of erythrocytes in humans is approximately 120 days. This means that after being produced, RBCs remain functional in the bloodstream for about four months before they are removed from circulation.

3. **Production of Erythrocytes**: RBCs are produced in the bone marrow through a process called erythropoiesis. This process involves hematopoietic stem cells that differentiate into red blood cells.

4. **Maturation of Erythrocytes**: Initially, the erythrocytes are immature. They mature while circulating in the blood vessels, which takes a short period.

5. **Destruction of Erythrocytes**: After their lifespan of about 120 days, erythrocytes are typically destroyed in the spleen, where old and damaged cells are filtered out.

6. **Conclusion**: Therefore, the correct answer to the question regarding the lifespan of erythrocytes in humans is 120 days.

**Final Answer**: The lifespan of erythrocytes in humans is about 120 days.

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