4. Red Blood Cells: 120-Day Lifespan
Red blood cells are remarkable for their crucial job: delivering oxygen to every cell in your body. These cells have an average lifespan of about 120 days before they’re removed and replaced by new ones from the bone marrow. This steady turnover ensures that your tissues always have a fresh supply of oxygen, directly influencing your energy levels and overall health. Disruption in this process can lead to anemia or other blood disorders. Learn more at MSD Manuals.