The sodium-potassium ion exchange

a) must reestablish ion concentrations after each action potential.
b) transports sodium ions into the cell during depolarization.
c) transports potassium ions out of the cell during repolarization.
d) moves sodium and potassium opposite to the direction of their electrochemical gradients.
e) depends on a hydrogen gradient for energy.

option D

The sodium potassium ion exchange move sodium and potassium in opposite direction in electrochemical gradients.

Explanation:

The sodium potassium pump is found in many animals plasma membranes and its moves the sodium and potassium ion in opposite direction across the plasma membrane with the hydrolysis of ATP(adenosine triphosphate) to supply the needed energy. It is an active transport process.

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah