What is the typical lifespan of a red blood cell?

• A. 10 days
• B. 30 days
• C. 120 days
• D. 240 days

Answer: (C)

Red blood cells, or erythrocytes, typically have a lifespan of around 120 days. This duration is significant because it reflects the time it takes for red blood cells to mature, perform their function of transporting oxygen throughout the body, and ultimately be removed from circulation after their lifecycle is complete. The lifespan is influenced by factors such as the cell's environment, the physiological conditions in the body, and the natural aging process of the cells.

After approximately 120 days, red blood cells are usually removed from circulation by the spleen and liver, where they are broken down and their components recycled. Understanding the lifespan of red blood cells is crucial in fields like medicine and biology, as it can impact various health conditions, blood disorders, and the body's overall homeostasis.