By the process of diffusion and osmosis.
One way is diffusion, another is osmosis and Active transport.
Any substance that dissolves in water, increases the conductivity of water. The most effective substances are salts.
It occurs when the medium surrounding the cell has a higher water concentration than the cell, the cell will gain water. At the same time many important molecules, and particles for growth, also move from one cell to another.
Most molecules can move in and out of a cell, but different molecules have different methods of getting in- Small Non-Polar molecules can diffuse across the lipid bilayer Medium sized molecules of any kind require a specific protein channel HUGE MOLECULES require a process called endo and exocytosis
Water molecules move with the help of membrane proteins called aquaporins, which regulate the movement of water in an out of the cell. Because of the dual nature of the membrane (hydrophobic and hydrophilic), water doesn't simply diffuse in an out, although a certain percentage can slip in between phospholipids.
cilia
Cell membrane controls which substances can move in and out of a cell. It is the dynamic boundary of cell
By the process of diffusion and osmosis.
a cell can only diffuse water, right? so it must be false cause that requires no energy
Both, there are two different hair like structures on cells.
alcohol, water, oxygen and carbon dioxide can all dissolve through the lipids in the cell membrane.
The cell membrane regulates the movement of substances in and out of the cell.How does it do this? The phospholipid bilayer is impermeable to most substances, allowing across only small, uncharged molecules such as those of oxygen, carbon dioxide, and water. The only way for other substances to cross the membrane is via transport proteins (channel and carrier proteins). These are selective, and therefore control what enters and what leaves the cell.
The hair like structures on sponge cells can be either cilia or flagella. These structures project from the surface of the cell and help to move substances.
Water can move passively through a membrane by moving through the pores of a cell. Other substances cannot move through a cell membrane.
Because substances move from areas of higher concentration to areas of lower concentration, the water would move either in or out of the cell. In the fresh water, there was a lower concentration inside the cell, so the water moved into the cell. In the salt water, there would be less water on the outside of the cell, so the water would move out of the cell.
Transport protein
by the chloroplast