Question

How is sodium replenished for the function of the sodium potassium pump if this pump pushes...

How is sodium replenished for the function of the sodium potassium pump if this pump pushes sodium to the interstitial fluid?
a. Sodium re-enters the cell through leak channels.
b. Sodium leaves the cell through leak channels.
c. Sodium re-enters the cell through passive transport
from the lumen.
d. Sodium leaves the cell through passive transport to the
lumen
Science   Anatomy-And-Physiology   
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Answer #1

Answer is option C i.e. Sodium re-enters the cell through passive channel from the lumen.

Explanation: Sodium potassium ATPase pump maintains the resting membrane potential of a cell by sending 3 Na​​​​+ ions out of the cells while moving 2 K+ ion into the cells.It is an active process as the process needs 1 ATP to be used.

Sodium re-enters the cell through Passive channels as the cell membrane is relatively not so much permeable to sodium ions. And as those channel does not need ATP to import sodium into the channels these are called passive channel.

Example: 1) In case of nerve cells it is voltage gated sodium channel which brings about action potential in the neurons.

2) It is Sodium Glucose symporter which allow sodium ion along with glucose molecule from the lumen of intestinal tract into the cells.

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