Question

Why is plasma membrane called selectively permeable membrane? How do substance like CO2 and water move in and out of the cell ?

Answer 1

Answer:

the plasma membrane is the outermost covering of a cell which allow or permit the entry and exit of some selected material in and out of the cell it prevent the movement of some other material because of this nature the plasma membrane is called a selectively permeable membrane. carbon dioxide and water move in and out of the cell by simple physiological process is diffusion and Osmosis diffusion refer to the movement of molecules from a reason of higher concentration to the reason of lower concentration across a permeable membrane. Osmosis refer to the movement of solvent from a reason of higher concentration to that of lower concentration across a semipermeable membrane. in case of carbon dioxide a cellular waste it concentration is h i g h inside the cell and low outside it as a result it move out off the c e l l governed by process of diffusion. water move abe y i n g principle of diffusion process but across a semipermeable membrane depending on the difference in IT concentration affected by the amount of substance dissolved in it on either side of the membrane. another word by Osmosis if the medium surrounding the cell has a higher water concentration than the cell then Water entered the cell while if the medium has a lower water concentration than the cell then Water goes out of the cell which has comparatively more water.