Movement through the plasma membrane

Movement through the plasma membrane - Movement through the...

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Movement through the plasma membrane The cell membrane separates the cell from the external environment. In order to communicate with the external environment for the purpose of survival (e.g., for the consumption of food, minerals etc.), there is movement in the cytoplasm and plasma membrane . This movement occurs through several mechanisms which are listed below: Osmosis : One method of movement through the membrane is osmosis. Osmosis is the movement of water. Osmosis often occurs across a membrane that is semipermeable . A semipermeable membrane allows only certain molecules to pass through while keeping other molecules out. Osmosis is really a type of diffusion involving only water molecules. Diffusion : Another method of movement through the membrane is diffusion. Diffusion is the movement of molecules from a region of higher concentration to one of lower concentration. This movement occurs due to molecules which constantly collide with each other. The total effectual momentum of the molecules is away from the region of high concentration to the region
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This note was uploaded on 11/10/2011 for the course BIOLOGY bi 101 taught by Professor - during the Fall '10 term at Montgomery.

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Movement through the plasma membrane - Movement through the...

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