Exam 3: The Plasma Membrane and Membrane Potential

Connective tissue has a large ____________________ matrix outside the cells.

____________________ is a positive ion that tends to passively leak out of cells.

The carbohydrate found in plasma membranes is functions as channels and pumps.

MATCHING Match the term to the correct description. -Enables tissues to stretch and recoil.

Which of the following statements concerning the plasma membrane is correct?

Osmosis does not occur if the concentration gradients for water and solutes are absent in a system.

Collagen

The cellular component that, once activated by the binding of an extracellular messenger to a surface receptor, in turn activates cyclic AMP is

Indicate the various roles of the following ions: -anion in greatest concentration in the ECF

Explain the direct and indirect contributions of the Na⁺-K⁺ pump to the generation of the resting membrane potential.

____________________ is a positive ion that tends to leak into cells.

Which of the following descriptions of movement of molecules across the plasma membrane is correct?

Cations tend to move toward a negatively charged area.

Oxygen gas tends to be lipid soluble.

The ____________________ refers to the maximum amount of a substance that can be transported across the plasma membrane via a carrier in a given time.

State how changing the five factors of Fick's Law of diffusion can increase net filtration.

In symport, the solute and Na+ move through the membrane in the same direction.

At the equilibrium potential for an ion, its ____________________ gradient is exactly counterbalanced by its electrical gradient.

The equilibrium potential for a given ion decreases as the difference in concentration of the ion outside and inside the cell increases.

Receptor sites on the outer surface of the plasma membrane are