Na + /K + –ATPase is considered to be an electrogenic pump because it contribute
ID: 224697 • Letter: N
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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