Na + /K + –ATPase is considered to be an electrogenic pump because it contribute

Question

Na+/K+–ATPase is considered to be an electrogenic pump because

it contributes to the negativity of the resting membrane potential.

the sodium ions are negatively charged.

it exhibits low permeability.

both it contributes to the negativity of the resting membrane potential and the sodium ions are negatively charged.

all of these choices

When a depolarizing graded potential makes the axon membrane depolarize to threshold,

ligand-gated Ca+2 channels close rapidly.

voltage-gated Ca+2 channels open rapidly.

ligand-gated Na+ channels close rapidly.

voltage-gated Na+ channels open rapidly.

During this period, a second action potential can only be initiated by a larger than normal stimulus

Latent period

Absolute refractory period

Relative refractory period

All of these choices

it contributes to the negativity of the resting membrane potential.

the sodium ions are negatively charged.

it exhibits low permeability.

both it contributes to the negativity of the resting membrane potential and the sodium ions are negatively charged.

all of these choices

Explanation / Answer

Ans 1 A it contributes to the negativity of resting membrane potential

It utilises ATP and pumps unequal quantities of Na+ and K+ across the membrane. It removes one net positive charge out of membrane each time contributing to its negative resting membrane potential.

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