click below
click below
Normal Size Small Size show me how
Chapter 3 part 1-2
Movement Through the Cell Membrane
Question | Answer |
---|---|
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 |
What is a Solution? | A solid, liquid, or gas that consists of one or more substances dissolved in the predominant solid, liquid, or gas. |
What are Solutes? | Dissolved substance |
What is a Solvent? | Does the dissolving |
What is Diffusion? | The tendency for solute molecules to move from an area of higher concentration to an area of lower concentration in a solution |
What is a Concentration Gradient? | The measure of the difference in the concentration of a solute in a solvent between two points |
What is Osmosis? | The diffusion of water (a solvent) across a selectively permeable membrane such as the cell membrane, from the region of higher water concentration to one of lower water concentration. |
What is Osmotic Pressure? | The force required to prevent the movement of water across a selectively permeable membrane. |
What does Hypotonic mean? | Lower concentration of solutes and a higher concentration of water than the cytoplasm of the cell |
What does Isotonic mean? | The concentrations of various solutes and water are the same on both sides of the cell membrane |
What is Hypertonic? | A solution usually has a higher concentration of solutes and a lower concentration of water than the cytoplasm of the cell |
What is Facilitated Diffusion? | A mediated transport process that moves substances into or out of cells from a higher to a lower concentration |
What is Active Transport? | A carrier-mediated process that moves substances from regions of lower concentration to ones of higher concentration against a concentration gradient |
What is a Sodium Potassium Exchange Pump? | Moves sodium ions out of cells and potassium ions into cells |
What is Endocytosis? | The uptake of material through the cell membrane by the formation of a membrane-bound sac called a vesicle |
What is Exocytosis? | The secretory vesicles move to to the cell membrane, where the vesicle membrane is eleminated from the cell |