18 terms

Cell Transport, Cell transport

Vocabulary: selective permeability, amphipathic, fluid mosaic model, integral protein, peripheral protein, glycoprotein, glycolipid, transport proteins, aquaporins, channel protein, carrier proteins, diffusion, osmosis, concentration gradient, passive transport, active transport, tonicity, isotonic, hypertonic, hypotonic, plasmolysis, crenation, proton pump, exocytosis, endocytosis, phagocytosis, pinocytosis, receptor-mediated endocytosis, ligands Objectives: After attending lectures and study…
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Terms in this set (...)

transport protein
a protein found in the cell membrane that helps charged or large molecules cross the membrane
diffusion
the movement of small particles from a region of high concentration to low concentration.
passive transport
the diffusion of a substance across the cell membrane WITHOUT the need of energy
osmosis
the diffusion of water across a membrane
facilitated diffusion
the passage of molecules across a membrane with the help of specific transport proteins, requiring no energy.
active transport
the movement of a substance across a cell membrane against its concentration gradient, requires ATP
phospholipid bilayer
a double layer of phospholipid molecules that form membranes in cells
hydrophobic
The term for why the tail of a phospholipid molecule is repelled by water
hydrophilic
The term for why the head of a phospholipid molecule is attracted to water
ATP
the molecule that provides energy for cellular processes by breaking a bond
cholesterol
molecule important in cell membranes because it allows it to remain fluid (the glue of the membrane)
hypotonic solution
contains less solute concentration than the cell; water will tend to enter the cell and it will swell
hypertonic solution
concentration of the solute outside of the cell is higher than it is inside; water will leave the cell causing it to shrink
isotonic solution
A solution in which the concentration of solutes is equal to that of inside the cell
solute
A substance that is dissolved in a solution. (Glucose or NaCl)
solvent
In a solution, the substance in which the solute dissolves. (Water)
Cell Membrane
Layer around every cell that separates it from the outside environment;it controls what can enter and leave the cell.
Homeostasis
Maintaining balance inside the cell

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