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Chapter 3 Human bio

Movement Through the Cell Membrane

QuestionAnswer
What are the four ways molecules can pass through the cell membrane 1. Directly through the phospholipid membrane. 2. Membrane channels. 3. Carrier molecules. 4. Vesicles
Solution homogeneous mixture forced when a solute dissolves in a solvent liquid
Solute dissolved substance in a solution
Solvent liquid that holds another substance in solution
Diffusion tendency for solute molecules to move from an area of higher concentration to an area of lower concentration in a solution; the product of the constant random motion of all atoms, ions, or molecules, in a solution
Concentration gradient is a measure of the difference in the concentration of a solute in a solvent between two points
Osmosis diffusion of solvent (water) through a selectively permeable membrane from a region of higher water concentration to one of lower water concentration
Osmotic pressure force required to prevent the movement of water across a selectively permeable membrane
Hypotonic solution that causes cells to swell
Isotonic solution that causes cells to neither shrink nor swell
Hypertonic solution that causes cells to shrink
Facilitated Diffusion carrier-mediated process that does not require ATP and moves substances into or out of cells from a higher to a lower concentration
Active Transport carrier-mediated process that requires ATP and can move substances into or out of cells from a lower to a higher concentration
Sodium Potassium Exchange Pump moves sodium ions out of cells and potassium ions into cells
Endocytosis bulk uptake of material through the cell membrane by taking it into a vesicle
Exocytosis elimination of material from a cell through the formation of vesicles
Created by: lgregor
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