Chapter 7 ≠ WHAT DO YOU KNOW?†††††††††††††††† † † Name ____________________

1.† One way cells maintain homeostasis is by controlling the movement of substances across the [ cell membrane / cytoplasm ].

2.† Movement across the cell membrane that does not require energy is called [ active / passive ] transport.

3.† The difference in the concentration of a substance across a space is called a concentration [ equilibrium / gradient ].

4.† If there is a concentration gradient, substances will move from an area of high concentration to an area of [ equal / low ] concentration.

5.† The cell membrane is [ selectively permeable / impermeable ].

6.† [ Equilibrium / Diffusion ] is the simplest type of passive transport.

7.† The diffusion of water through a selectively permeable membrane is called [ osmosis / diffusion ].

8.† The direction of water movement across the cell membrane depends on the concentration of free water [ molecules / solutions ].

9. A solution that causes a cell to swell is called a [ hypertonic / hypotonic ] solution.

10.† Organelles that collect excess water inside the cell and force water out are called [ diffusion organelles / contractile vacuoles ]

11.† The process of taking material into the cell by infolding the cell membrane is called [ endocytosis / exocytosis ]

12.† In [ facilitated / molecular ] diffusion, membrane proteins help molecules across the membrane.

13.† In diffusion, molecules [ spread out / condense ]

14.† The lipid bilayer describes [ a type of transport / the cell membrane ]

15.† Facilitated diffusion moves substances down their concentration gradient [ with / without ] using the cellís energy.†