Channel proteins which are always open for Na+ allow Na+ to move _________. Na+ is moving ____ its concentration gradient.
Out of the cell; down
Out of the cell; up
Into the cell; up
Into the cell; down
The concentration of sodium is high in the extracellular fluid (140 MEq) when compared to the intracellular fluid (20 MEq). Active transport takes place against the concentration gradient while passive transport or diffusion takes place along the concentration gradient.
So, channel proteins that always open for sodium ions allow sodium to move into the cell. Sodium is there for moving down its concentration gradient. Therefore the correct answer for this question is option D.
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