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As cells get bigger, the components (used to be called organelles but I guess that's changed) get further from the cell walls or membranes. Given the limitations of transport mechanisms within cells, their ability to interact with the cell exterior would eventually be limited to such an extent that the cell would no longer be viable (volume:area). This logic would suggest that cells that do not require much interaction could be comparatively big e.g. some plant and animal structural cells or human eggs (not sure where ostrich eggs fit - are they uni or multi Why_can't_single_cells_grow_very_largestructures?). But, this logic is based on a vision of a cell as a sphere and, by elongating, flattening or other deviation from the sphere, cells can grow larger whilst maintaining effective interaction with the cell exterior e.g. nerve and skin cells.

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