Chit varnan 5 lines on mere vidyalay par sanskrit me
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this is the outermost covering of the cell that separates the contents of the cell from its external environment the plasma membrane allows or permits the entry and exit of some materials in and out of the cell it also prevents movement of some other materials the cell membrane therefore is called a selectively permeable membrane some substance like carbon dioxide or oxygen can move across the cell membrane by a process of diffusion we have studied the process of diffusion in a real chapters we saw that there is a spontaneous movement of a substance from equation of high concentration to a region where its concentration is low something similar to this happens in cell when for example some substance like CO2 accumulates in high concentration inside the cell in the cells external environment the concentration of co2 is low as compared to the inside of the co2.
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