Ionic Concentration Gradient

Question

How does the sodium potassium pump help maintain the resting membrane potential? Choose the correct option.

A) Pumps potassium in and sodium out

B) Pumps sodium in and potassium out

C) Exchanges a sodium and a potassium for a calcium

D) Uses calcium to pump sodium and potassium against their concentration gradients

Question

Which of the following mechanisms decrease intracellular [Ca2+]? Choose the correct option.

A) The calcium pump

B) Intracellular calcium-binding proteins

C) Organelles such as mitochondria and endoplasmic reticulum

D) All of the above

Question

What is the meaning of an ion’s equilibrium potential? Choose the correct option.

A) Net movement of ions from a region of high concentration to a region of low concentration

B) Electrical potential difference that exactly balances an ionic concentration gradient

C) Difference between the real membrane potential and equilibrium potential for a particular ion

D) Difference in concentration between region with high ionic concentration and region with low ionic concentration

Question

What is the term used to describe the mechanism for the regulation of [K+]o by astrocytes? Choose the correct option.

A) Depolarization

B) Potassium spatial buffering

C) Blood-brain barrier

D) Goldman equation