The life span of 'WBC' is ______.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (12 - 20) days
White blood cells (WBCs, leucocytes) defend the body against infection. They live far shorter lives than red blood cells; the life span usually quoted for them is about 12 to 20 days, although it differs from one kind of WBC to another (some last only hours or days, a few memory lymphocytes for years).
The figure of 100–120 days belongs to red blood cells, which are then broken down in the spleen and the liver.