Exam 3: The Plasma Membrane and Membrane Potential

Gap junctions play an important role in transmission of impulses for heart contraction.

Opening a sodium channel when the membrane potential is at equilibrium will cause

Which statement about the plasma membrane is true?

Sodium-potassium pumps indirectly provide the energy source for SGLT carriers in intestinal cells.

Indicate the various roles of the following ions using the answer in the column below. a.Na+ b.K+ c.A- d.Cl- -Ion whose equilibrium potential is exactly equal to the resting membrane potential

Which statement(s) would be true about the resting membrane potential?

The rate at which "X" can diffuse through a plasma membrane is inversely proportional to the

Pinocytosis is a form of

The Nernst equation takes into account the permeabilities and concentration gradients for all permeable ions in order to calculate the membrane's equilibrium potential.

Exocytosis of secretory products from neuron terminals is triggered by the entry of ____ into the ____.

The ____________________ pump moves two ____________________ ions into the cell for every three ____________________ ions it moves out the cell.

Endocytosis and exocytosis are both examples of ____________________ transport.

Indicate whether the force in question tends to move the involved ion into or out of the cell by filling in the blank using the following code. a.tends to move the ion into the cell b.tends to move out of the cell -Electrical gradient for K⁺ at resting potential

Scurvy is caused by a vitamin C deficiency that prevents the proper development of desmosomes; hence, tissue cells do not hold together.

What might account for a net movement of water from solution X into solution Y?

Potassium ions are attracted toward a more positively charged area along an electrical gradient, while chloride ions are attracted toward a more negatively charged area.

A single phospholipid in the plasma membrane

If two similar molecules can both combine with the same carrier, the presence of one of these molecules decreases the rate of entry of the other.

Under normal conditions, the movement of potassium into a cell always requires the splitting of ATP.

Net sodium movement into the cell occurs passively, whereas net sodium movement out of the cell occurs actively.