If the cell membrane is semi permeable, how do the substances get through the cell wall?
Semi permeable means it can let some molecules pass the membrane but not all
small molecules like water would easily pass through the semi permeable membrane
while large molecules like sugar will not pass through the membrane because they are too big to pass
It only lets some molecules pass through.
Small molecules like water
Whereas, large molecules like glucose
After that, they can pass through the cell wall like small molecules and be absorbed by the cell.