Most cells in the body are specialized for one particular organ and stay there, such as the cells that line the stomach or muscle cells. Some cells migrate during their lifespan, like cells of the epidermis, which start deep in the skin and are pushed out to the surface, there they flake off. The furthest moving cells are those that make up blood, such as erythrocytes and leukocytes, which move throughout the body to transport oxygen, nutrients and warmth to every organ system. The blood vessels that they travel through can be wide arteries like the aorta, or capillaries so thin that only one cell can fit through at a time!
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