Cellular transport

Cell membranes are involved in the transport of various substances within cells, and use several processes by which they carry out their functions. All cells acquire the molecules and ions they need through their plasma membranes. In eukaryotic cells, there is also transport in and out of membrane-bounded organelles such as the nucleus, ER, and mitochondria.
One of these types of cellular transport is osmosis. Osmosis is the diffusion of water from a region of high water concentration to a low water concentration through a semi-permeable cell membrane without the use of energy. This cell membrane is not able to allow large particles such as starch pass it, yet the fluidity of the membrane allows water to pass through due to its size and structure. Water moves toward areas of lower concentration until its water potential is zero, which the cell membrane regulates. Osmosis is the transport of water from high to low osmotic potential, low to high solute concentration, and low to hi...