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

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

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

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

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

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

7. 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.

8. 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*

9. 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*

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

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

12. The End