Why Molecules Move Across The Cell Membrane

The way that the molecules move across the cell membrane is that the carbon dioxide molecules spread out rapidly out your red blood cells down their concentration gradient to your lungs. When water molecules move freely through your cell membrane is called osmosis as we learned last unit. The reason why molecules move across the cell membrane is because they are small molecules that have no charge like oxygen which the cell membrane need to survive. So basically the molecules that move across the cell membrane are necessary to it in order for it to survive. There are four different types of cellular transport and they all have different roles to play. Active transport is one of the four. What active transport does is that it moves all the