Cell Transport

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Terms in this set (...)

cell membrane
A cell structure that controls which substances can enter or leave the cell.
phospholipid
A molecule that makes up a bilayer of membranes. Has both a hydrophilic head and a hydrophobic tail.
fluid mosaic model
Model for the structure of the plasma membrane where molecules are free to move sideways within a lipid bilayer.
selective permeability
A function of a plasma membrane that allows some substances to cross more easily than others.
passive transport
Requires NO energy. Movement of molecules from high to low concentration.
diffusion
Movement of particles or molecules from an area of high concentration to an area of low concentration
osmosis
Diffusion of water across a selectively permeable membrane
isotonic
A solution that has an equal concentrations of solutes and water as another.
hypertonic
A solution that has a higher concentration of solutes and less water than another.
hypotonic
A solution that has a lower concentration of solutes and more water than another.
active transport
Energy-requiring process that moves molecules in or out of the cell against its concentration gradient (from low to high).
solute
substance that is dissolved in a solution
hydrophilic
water loving. substances that easily mix with water.
hydrophobic
water hating. substances that will not mix with water.
turgor pressure
A plant cell in a hypotonic environment. The best situation for plant cells
plasmolysis
A plant cell in a hypertonic environment. Causes the plant cell to lose turgor pressure.
endocytosis
The movement of large particles INTO a cell
exocytosis
The movement of large particles OUT of a cell
surface area to volume ratio
There must be a large ratio for the cell to transport molecules efficiently.

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