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How do potassium ions travel as they move into the cell?
  • a)
    Down the concentration gradient and up the membrane potential
  • b)
    Up the concentration gradient and down the membrane potential
  • c)
    Down the concentration gradient and down the membrane potential
  • d)
    Up the concentration gradient and up the membrane potential
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
How do potassium ions travel as they move into the cell?a)Down the con...
Potassium ions (K+) move into the cell by a process known as facilitated diffusion, which involves the movement of ions from an area of higher concentration to an area of lower concentration. In the case of potassium ions, they move from the extracellular fluid, where their concentration is higher, to the intracellular fluid, where their concentration is lower.
The movement of potassium ions is also influenced by the membrane potential, which is the difference in electrical charge across the cell membrane. The inside of the cell is negatively charged compared to the outside. This electrical gradient tends to attract positively charged potassium ions into the cell.
Therefore, the overall movement of potassium ions involves moving up the concentration gradient (from high to low concentration) and down the membrane potential (from a more positive to a less positive or negative potential) to enter the cell.
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