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Biology: Chapter 5.1

Chapter 5.1 Vocabulary

TermDefinition
Passive Transport a process where some substances can cross the cell membrane without any input of energy by the cell
Diffusion the movement of molecules from an area of higher concentration to an area of lower concentration
Concentration Gradient the difference in the concentration of molecules across a distance
Equilibrium the concentration of molecules with be the same through the space the molecules occupy
Osmosis the process by which water molecules diffuse across a cell membrane from an area of higher concentration to an area of lower concentration
Hypotonic when the concentration of solute molecules outside the cell is lower than the concentration in the cytosol, the solution outside is *blank* to the cytosol
Hypertonic when the concentration of solute molecules outside the cell is higher than the concentration in the cytosol, the solution outside is *blank* to the cytosol
Isotonic when the concentrations of solutes outside and inside the cell are equal, the outside solution is said to by *blank* to the cytosol
Contractile Vacuole organelles that remove water
Turgor Pressure the pressure that water molecules exert against the cell wall
Plasmolysis the condition (in a hypertonic environment) where water leaves the cells through osmosis, the cells shrink away from cell walls, and turgor pressure is lost; reason that plants wilt of they don't receive enough water
Cytolysis the condition (in a hypotonic environment) where water diffuses into the cells, causing them to swell and eventually burst; the bursting of cells
Facilitated Diffusion another type of passive transport; process is used for molecules that cannot readily diffuse through cell membranes, even when there is a concentration gradient across the membrane
Carrier Protein proteins that assist molecules that are not soluble in lipids, or may be too large to pass through the pores in the membranes
Ion Channel another type of transport that involves these membrane proteins; transports ions from higher to lower concentrations
Created by: truongm19