Terms in this set (25)
Molecules move from high concentrated to low concentrated.
Diffusion that doesn't require energy from the cell.
Doesn't require energy from the cell; passive transport form.
Diffusion of water across a membrane.
Sodium- potassium pump
Moves ions against their concentration gradient, from where they are less concentrated to more concentrated.
Require energy to move, such as, ATP to move sodium ions out of the cells, potassium in.
A type of active energy that move sodium down the concentrated gradient created by the pump and glucose moves against it.
Materials can be exported in vesicles that fuse with the plasma membrane and release their contents outside the cell.
Plasma membrane pinches in, forming a vesicle that contains material from outside the cell.
Diffusion of Gases
Oxygen and carbon dioxide diffusing across the lipid bilayer.
Individual dye molecule
Motion, random whether or not a concentration gradient is present.
Population of dye
Diffusion, when the net movement when a concentration gradient is present.
Solutes that can rapidly cross a lipid bilayer are
Small and nonpolar
Solutes can cross a lipid bilayer, but not as quickly
Small and polar
Lipid bilayer is essential impermeable to solutes that are
Oxygen, carbon dioxide, lipids.
Sucrose, water, proteins.
Form pores in the plasma membrane and transport primarily inorganic ions(Na+ or K+) or water
Have solute binding sites that enable transport of small polar molecules such as sugars or amino acids.
Transport water or inorganic ions,
Pores in a membrane
Transport small polar molecules such as sugar amino acids
Solute across the membrane through sequence of subtle shape changes.
Allow water molecules and small ions to flow quickly across the membrane.
Provide a continuous path across the membrane.
Undergo a change in shape to transport solutes across the membrane
Transport primarily small polar organic molecules.
Are integral membrane proteins.
Provide a hydrophilic path across the membrane.
Transport solutesdown a concentration or electrochemical gradient.