Exam 3: The Plasma Membrane and Membrane Potential

The following questions refer to comparative concentrations, permeabilities, and potentials under various circumstances. Indicate the relationship between the two items listed in each situation by following answer code. -A. concentration gradient for K? at the equilibrium potential for K? B. electrical gradient for K? at the equilibrium potential for K?

Refer to the accompanying diagram to match the following ions with the statements below. Answers may be used more than once -Companion ion of sodium.

Gap junctions are composed of CAMs and keratin.

The sodium-potassium pump indirectly offers the energy source for glucose transport across intestinal cells.

By facilitated diffusion particles move from a(n) ____________________ concentration to a(n) ____________________ concentration.

Select the structure that promotes cell adhesion.

The phospholipids within the plasma membrane

____ are adhering junctions, ____ are impermeable junctions, and ____ are communicating junctions.

Indicate whether the force in question tends to move the involved ion in or out of the cell by filling in the blank using the following answer code. -concentration gradient for Na⁺ at resting potential

Because a solution of lower solute concentration has a higher concentration of water, it exerts a lower osmotic pressure than does a solution with a higher solute concentration.

The membrane is more permeable to sodium than potassium at rest.

Indicate whether the force in question tends to move the involved ion in or out of the cell by filling in the blank using the following answer code. -Na⁺-K⁺ pump for Na⁺

Which of the following is not part of the extracellular matrix?

Indicate which constituent of the plasma membrane is responsible for performing the function in question by filling in the appropriate blank using the answer code below. -Determines the degree of fluidity of the membrane.

MATCHING Match the term to the correct description. -Is a cell that is a fiber-former.

____________________ is a rubber-like protein found in tissues in organs such as the lungs.

The plasma membrane is not impermeable, but it is ____________________.

In ____________________ transport, sodium and the accompanying molecule are moved in same directions across the membrane.

Sheets of epithelial cells are joined by gap junctions.

The following questions refer to comparative concentrations, permeabilities, and potentials under various circumstances. Indicate the relationship between the two items listed in each situation by following answer code. -A. concentration of K? in the extracellular fluid B. concentration of K? in the intracellular fluid of a resting nerve cell