Vocabulary Review 10 Words Unit 3 “Cell Transport” Vocabulary Review 10 Words

Plasma (Cell) Membrane Flexible, selectively permeable boundary that helps control what enters and leaves the cell.

Concentration Gradient A separation between areas that have different solute concentrations, sometimes separated by a barrier like a membrane

Diffusion Net movement of particles from an area of higher concentration to an area of lower concentration.

Diffusion of water across a selectively permeable membrane. Osmosis Diffusion of water across a selectively permeable membrane.

Facilitated Diffusion Passive transport of ions and small molecules across the plasma (cell) membrane by transport proteins. *No Energy*

Isotonic A solution with the same concentration of water and solutes as inside a cell, resulting in the cell retaining its normal shape because there is no net movement of water.

Hypertonic A solution that has a higher concentration of solute outside than inside a cell, causing water to leave the cell by osmosis. * Shrivel or Shrink*

Hypotonic A solution that has a lower concentration of solute outside than inside the cell, causing water to flow into the cell by osmosis. * Swell or Explode*

Active Transport Energy-requiring process by which substances move across the plasma membrane against a concentration gradient. * Walking up a hill*

Homeostasis Regulation of an organism’s internal environment to maintain conditions needed for life. * Stable/balanced*

The End