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Across 1. is a condition in which the concentratrion of a substance is equal throughout a space 3. is a transport protein with a polar pore through which ions can pass 7. the transport of a substance across the cell membrane against its concentration gradient 13. the diffusion of water through a selectively permeable 14. transports three sodium ions out of a cell 2 potassium ions into the cell 15. a difference in the concentration of a substance. such as the balls, across a spacce

Down 1. the movement of a substance into a cell by a vesicle 2. carries a substance across the cell membrane and relase it on the other side 4. a solution that causes a cell to shrink because of osmosis 5. type of passive transport 6. a solution that produces no change in cell volume because of osmosis 8. the movement of a substance by as vesicle to the outside of a cell 9. a protein that binds to specific signal molecule enabling the cell to respond to the signal molecule 10. move meant across the cell membrane that does not require energy from the cell 11. acts as a signal molecule into the cytoplasm 12. the movement of a subtace from an area of lower concentration caused by the random motion of molecules of the substance