How Does the Human Body Eliminate Dead Cells? 
The human body is a complicated system which operates much like a 
self-contained city. Some organs produce new cells, others use cells to perform 
their jobs, and eventually certain scavenger cells arrive to remove dead cells 
from the system. In the case of the human body, these scavengers are 
specialized white blood cells called macrophages. Macrophages remove dead cells 
essentially by eating them, which helps to explain why the word macrophage 
means "big eater" in Greek.

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