Cell membranes are porous and will allow water into the cell (in a regulated manner, of course).
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Hydration of cell contents is primarily driven by osmosis, which is the movement of water from an area of higher concentration to an area of lower concentration. This process helps maintain cell turgor pressure and allows for efficient transport of nutrients and waste in and out of the cell. Additionally, various ion pumps and channels on the cell membrane play a role in regulating the movement of water and ions to maintain cellular hydration.
Mitosis is the process that divides the cell nucleus and it's contents.
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Cell membrane
Substances outside a cell are transported into the cell by vesicles during endocytosis. This process involves the formation of a vesicle that engulfs the particles or molecules outside the cell, then fuses with the cell membrane to bring the contents into the cell.
Protoplasm is the living contents of a cell that is surrounded by a plasma that the cell contents are structurally very complex and contain multiple organelles.