Which of the following statements is true with regard to this animation? sodium ions are transported down their concentration gradient. both sodium and potassium ions are transported against their concentration gradients. the cell is not expending energy. the cell does not expend atp. potassium ions are transported down their concentration gradient

Both sodium and potassium ions are transported against their concentration gradients

Explanation:

In the cell, the sodium potassium pump is a type of transport, of the active type.

It requires an energy expenditure and always goes against gradient.

For every 3 Na + that leave, 2 K + enter and the action hydrolyzes an ATP (ADP + P)

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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