Biology - 8.1

Passive Transport

The movement of particles across cell membranes by diffusion or osmosis; the cell uses no energy to move particles across the membrane

Hypertonic Solution

In cells, solutions in which the concentration of dissolved substances outside the cell is higher than the concentration inside the cell; causes a cell to shrink as water leaves the cell

Active Transport

Energy - expending process by which cells transport materials across the cell membrane against a concentration gradient

Endocytosis

Active transport process where a cell engulfs materials with a portion of the cell’s plasma membrane and releases the contents inside of the cell

Hypotonic Solution

In cells, solution in which the concentration of dissolved substances is lower in the solution outside the cell than the concentration inside the cell; causes a cell to swell and possible burst as water enter the cell

Exocytosis

Active transport process by which materials are secreted or expelled from a cell

Isotonic Solution

In cells, solution in which the concentration is dissolved substances in the solution is the same as the concentration of dissolved substances inside a cell

Facilitated Diffusion

Passive transport of materials across a plasma membrane by transport proteins embedded in the plasma membrane

Osmosis

Diffusion of water across a selectively permeable membrane depending on the concentration of solutes on either side of the membrane