1. Plasma membrane defines the boundary of the cell and regulates the flow of materials into and out of the cell.

    Plasma membrane defines the boundary of the cell and regulates the flow of materials into and out of the cell.

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  2. Ruptured plasma membrane generally heals within no time but if rupturing does not heal, the cell contents will spill over and the cell is killed.

    Ruptured plasma membrane generally heals within no time but if rupturing does not heal, the cell contents will spill over and the cell is killed.

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  3. The process of movement of a substance (solid, liquid or gas) from the region of higher concentration to the region of lower concentration so as to spread uniformly is called diffusion.

    The process of movement of a substance (solid, liquid or gas) from the region of higher concentration to the region of lower concentration so as to spread uniformly is called diffusion.

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  4. Selectively permeable membrane is the one which allows entry of certain substances, exit of some substances but prevents the passage of other substances, through it.

    Selectively permeable membrane is the one which allows entry of certain substances, exit of some substances but prevents the passage of other substances, through it.

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