Question

why is the plasma membrane is called selectively permeable membrane​

Answer 1

Answer:

class 9th right just second

The plasma membrane is called as selectively permeable membrane because it regulates the movement of substances in and out of the cell. It means that the plasma membrane allows some material to pass through it while at the same time it blocks other material from entering through it

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Answer 2

Answer:

Yes, it can be both. Semipermeable suggests that the membrane allows some substances to pass through, but not all, and this is generally by DIFFUSION. Selectively permeable suggests that a specific substance can pass through and is much more limited, and is usually by a carrier mediated process such as facilitated diffusion or active transport. So, as an example, a membrane might allow small ions like sodium and potassium and chloride to pass through, but not allow other small molecules to pass. This would be the semipermeable aspect. Then a membrane may be SELECTIVELY permeable to glucose, but not allow other monosaccharides to pass. This would suggest a specific carrier protein for glucose that cannot be used by other monosaccharides. This would be the selectively permeable aspect.

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