# Which of the following cells has a lifespan of only a few hours to a few days?
a. Red blood cell
b. White blood cell
c. Surface-covering cells
d. Cells of the liver, kidney, and thyroid
The correct answer is B. White blood cells.
Red blood cells live approximately 120 days before they are ingested by macrophages.
The lifespan of a white blood cell is only a few hours to a few days.
Surface-covering cells—such as those of the skin, hair, or nails—renew as they are replaced.
Other cells in the body—such as those of the liver, kidneys, and thyroid gland—do not normally renew after maturity unless they are injured.
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