Question

why is cell membrane called a selectively permeable membrane? how do substances move in and out of the cell?​

Answer 1

Answer: as it permits the movement of only certain molecules in and out of the cells   It lets some substances pass through rapidly and some substances pass through more slowly, but prevents other substances passing through it at all. Some small molecules such as water, oxygen and carbon dioxide can pass directly through hey keep toxic substances out of the cell, In all living cells substances like water and carbon dioxide move in and out by a physical process called diffusion. The phenomenon of mixing of particles of different substances together is known as diffusion. Diffusion takes place because of the movement of particles of matters. Diffusion is a natural process.      

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Answer 2

Explanation:

The cell membrane on the plasma membrameis knows as selectively permeable membrane because it regulates the movement of substances in and out of the cell. This means the that plasma membrane allow the entry of only some substance and prevents the movement of some other materials .

The cell membrane, therefore is called a selectively permeable membrane.

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