Exam 5: Membrane Dynamics

Compare and contrast primary active transport and secondary active transport, noting any special differences.

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

If someone has a muscle cramp or spasm, a commonly discussed treatment is to consume a banana (or another food high in potassium).Why would this be a possible treatment for muscle cramps or spasms?

Match the membrane protein with its function. -transporters

As the charge on the membrane of a typical neuron approaches 0 from -70 mV, the cell is

Passive transport refers to a process that requires

The cell membrane acts as a good

Indicate the relative osmolarities of the following solutions. Solution a: 2 osmolar NaCl Solution b: 1 molar NaCl Solution c: 900 milliosmolar glucose A.a is ________ osmotic to b.  D.a is ________ osmotic to c. B.b is ________ osmotic to a.  E.b is ________ osmotic to c. C.c is ________ osmotic to a.  F.c is ________ osmotic to b.

Match the potential or potential change with the causative circumstances.Assume ion movements are net movements.Answers may be used more than once or not at all. -membrane potential is 0 mV

Match the type of transport with its description. -movement from the extracellular fluid into the lumen of an organ

You are a server in a restaurant, always interested in going the extra mile for your customers.Patrick, a regular customer in your section, has ordered sweet iced tea and has an appointment in 10 minutes, so he must drink quickly then leave.The kitchen staff makes only unsweetened tea, but there are sugar packets on the tables.What should you do for Patrick to provide the best sweet tea, and what general principle of diffusion does this illustrate? (Hint: Will sugar dissolve quickly in an iced drink?)

Membrane protein pores that can be opened and closed are called ________ channels.

Match the type of transport with its description. -between adjacent cells

Which of the following is NOT involved in creating the resting potential of a neuron?

Explain the term dynamic steady state.

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

The concentration of calcium inside a cell is 0.3%.The concentration of calcium outside the cell is 0.1%.How could the cell transport even more calcium to the inside?

There are two solutions separated by a semipermeable membrane.Solution a is 0.3 M glucose, and solution b is 0.15 M NaCl.Will there be a net flow of water across this membrane? Why or why not?

The membrane proteins that change shape and bind with specific molecules to transport them across the cell membrane are ________.

Which of the following is a way for solutes in an aqueous solution to move from an area of high solute concentration to an area of low solute concentration?