During this step, the pump releases Na + into the extracellular fluid. Na + has now been transported from the cytoplasm to the extracellular fluid. Which of the following best describes why Na + isn't also transported in the opposite direction-from the extracellular fluid to the cytoplasm?

Question

Biology

Westie

27 May, 12:49

During this step, the pump releases Na + into the extracellular fluid. Na + has now been transported from the cytoplasm to the extracellular fluid. Which of the following best describes why Na + isn't also transported in the opposite direction-from the extracellular fluid to the cytoplasm?

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Answers (1)

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Elianna · Answer 1

It is described the Na+/K + pump and the Na + does not return to the cell because the channels are closed.

Explanation:

During certain stimulus, as the nerve impulse, the Na + channels are opened and the Na + enter to the cytoplasm.

In order to recover the membrane potential and the electrochemical balance, the cell use the Na+/K + pump, wich transport 3 Na + outside the cell and enter 2 K+, using 1 ATP as energy.