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Chapter 3 part 1-2

Movement Through the Cell Membrane

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
Created by: trinalynn93