What does semi permeable membrane do?

Answer 1

I semi-permeable membrane is a membrane when only certain substances can pass through it.
it is a membrane that will only allow certain molecules through it . in general oxygen , food and water are allowed to enter ; waste products are allowed to exit and harmful substances are kept out. hope this helps.

Answer 2

A semipermeable membrane lets certain molecules, especially small ones, pass through and prevents other molecules from crossing.
A semi permeable membrane is a barrier that lets some things in and not other things.

The semipermeable membrane is found in somatic cells in the body. is generally formed by a phospholipid bilayer (two layers of fat molecules) which restrict molecules going in and out of the cell.

Answer 3

lets some molocules in and some not