(1) What would be the likely outcome if an increase in both intracellular sodium

Question

(1) What would be the likely outcome if an increase in both intracellular sodium ion levels and extracellular potassium ion levels were to occur?

A: The Na+-K+ pump would accelerate because it needs to restore the membrane's resting concentration gradient.

B: The Na+-K+ pump would slow down because it needs to restore the membrane's concentration gradient.

C: Sodium and Potassium ions would be pumped out of the cell.

D: Sodium and Potassium ions would increase their movement in both directions across the cell membrane.

(2) Due to the unequal transport of sodium and potassium ions by the Na-K pump, a membrane potential is generated.

True or False

(3) If a pump moves 3 positive ions out and 2 positive ions in against their concentration gradients, the membrane potential in the cell will become more positive.

True or False

Explanation / Answer

1. The exterior of the cell has a net positive charge and the interior has a net negative charge. This is because Na+/K+ ATPase pumps Na+ ions out of the cell against concentration gradient. Thus, make outside of the cell more positively charged. This is very much necessary to maintain the membrane potential. If there is an increase in both intracellular sodium ion levels and extracellular potassium ion levels were to occur, they the Na+-K+ pump would accelerate because it needs to restore the membrane's resting concentration gradient.

Hence, the correct option is A.

2. The given statement is true.

3. The given statement is true.

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