Bio 220 - Chapter 5 Membrane Dynamics

Some transport processes use transport proteins in the plasma membrane, but do not require ATP. This type of transport is known as...

The majority of water molecules moving across plasma membranes by osmosis do so via a process that is most similar to...

The sodium-postassium pump uses ATP to move sodium and postassium ions across the plasma membrane.  This statement describes...

A vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid.  This statement describes...

A water filled passage that allows small molecules to pass through the membrane

transports larger molecules by binding to the protein

Active transport of molecules require ATP because 

The tonicity of a solution depends ONLY upon the...

The membrane potential of most cells

Which body fluid compartment contains high levels of K+, large anions, and proteins?

which body fluid compartment contains higher levels of Na+, Cl-, and HCO3-?

bulk flow is fluid flow as a result of a ___ gradient.

what are the two extracellular fluid compartments in the body?

The ion that plays a key role in initiating electrical signals in neurons is

passive transport refers to a process that requires

Na+ ions are more concentrated in the extracellular fluid than in the intracellular fluid. This is an example of

The inside of a resting cell is slightly negative relative to the outside.  This is an example of

Water will always move from ___ areas to ___ areas.

membranes are selectively

permeability is determined by

rate of diffusion is proportional to:
Surface area X concentration gradient X permeability

divided by: membrane thickness

movement of molecules from a region of high concentration to a region of low concentration due to the kinetic energy inherent in the molecules

diffusion that does not require input of energy

rate of diffusion is affected by:

proteins embedded in the membrane that move molecules from one side to the other

two types of transport proteins?

water filled tubes that allow specific molecules to pass

a transport protein that binds to the molecule then changes shape to carry it 

two types of cotransport proteins

a cotransporter that carries two molecules in the same direction

a cotransporter that carries two molecules in opposite directions (NaK pump)

transport channels that remain open

passive transport is also called

molecules moving against the concentration gradient and requires energy

active transport requires

two types of active transport

Transport when ATP is directly activating a protein

Transport that uses the energy of a concentration gradient to pump another ion (not Na+) out of the cell

the interaction between the protein transporter and its ligand is specific

molecules that have similar structure will compete with each other for binding to the transport protein

the transport protein can only accomodate so many molecules at a time - reaches max rate

movement of a large molecule, whole organisms, or damaged cells

a type of endocytosis that creates a tunnel through a cell

moving molecules out of cells, mostly proteins

moving molecules in to cells

the Na+K+pump is a type of _____ transport

molarity is calculated by

osmolarity is the 

two solutions have the same osmolarity

this solution has fewer dissolved particles than the other

this solution has more dissolved particles than the other

the number of particles in a solution

Compares the inside of the cell to the fluid outside the cell

this type of solute is not factored when considering tonicity

water does not move into or out of the cell

water will leave the cell
cell shrinks

water will enter the cell
cell will swell

charge distribution that creates disequilibrium is from the activity of

the separation of charges at unequal distribution across a membrane results in

the difference between the outside and the inside of membranes mades the membrane

if the difference in charge of the membrane increases it becomes

if the difference in charge of the membrane decreases it becomes