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Why do Na⁺ ions enter the cell when voltage-gated Na⁺ channels are opened in neurons? A. because the Na⁺ concentration is much lower outside the cell than it is inside B. because the Na⁺ ions are actively transported by the sodium-potassium pump into the cell C. because the Na⁺ concentration is much higher outside the cell than it is inside, and the Na⁺ ions are attracted to the negatively charged interior D. because the Na⁺ concentration is much higher outside the cell than it is inside, and the Na⁺ ions are actively transported by the sodium-potassium pump into the cell

Answer :

The correct answer for this question is 'D'.

In cellular physiology, a sodium-potassium pump is a protein found in many cells that keeps the internal concentration of potassium ions [K+] higher than the surrounding medium (blood, body fluid, water) while keeping the internal concentration of sodium ions [Na+] lower. The pump, which has ATPase activity, traverses the cell membrane and is activated by both external [K+] and internal [Na+]. This enzyme transports (pump) Na+ outward and K+ inward using metabolic energy. The steady-state difference in Na+ and K+ concentrations maintained by the pump determines the resting potential of cells and related bioelectric phenomena such as the action potential. Other ion pumps that transport different ions have also been discovered.

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