MICROANATOMY

Detailed explanation-1: -Normal human red blood cells have an average life span of about 120 days in the circulation after which they are engulfed by macrophages. This is an extremely efficient process as macrophages phagocytose about 5 million erythrocytes every second without any significant release of hemoglobin in the circulation.

Detailed explanation-2: -Red blood cells at work Red blood cells also remove carbon dioxide from your body, bringing it to the lungs for you to exhale. Red blood cells are made in the bone marrow. They typically live for about 120 days, and then they die.

Detailed explanation-3: -Red blood cells have a limited lifespan because they don’t have a center membrane (nucleus). When a red blood cell travels through your blood vessels, it uses up its energy supply and only survives an average of 120 days.

Detailed explanation-4: -White blood cells are also called leucocytes. They are irregular and colorless cells with a nucleus. They protect the body from infections and foreign particles. The lifespan of WBC is about 12-20 days.

Detailed explanation-5: -So, the correct answer is ‘120 days’