Question

The life span of human WBC is approximately

• A. Less than 10 days
• B. Between 20 to 30 days
• C. Between 2 to 3 months
• D. More than 4 months

Answer 1

Answer: (A)

Less than 10 days

The life span of WBC ranges from 6 - 20 days, depending on the type, after which they are destroyed in the lymphatic system. When immature WBCs are first released from the bone marrow into the blood, they are called bands or stabs. The life span of a circulating human neutrophil is about 5.4 days, while the life span of the monocyte is 10 - 20 hours.