Question

63. In typical cell, which of the following has the highest electrochemical potential for movement? A. the electrochemical potential for Na to move into the cell B. the electrochemical potential for Na to move out of the cell C. the electrochemical potential for K to move into the cell D. the electrochemical potential for K to move into the cell the electrochemical potential for CT to move into the cell 64. In a typical cell, which of the following has the highest leakage? A Na leaks into the cell. B. Na leaks out of the cell. C. K leaks into the cell. D. K leaks out of the cell. E. Cr leaks into the cell.

Answer 1

63) The correct answer is - the electrochemical potential for K+ to move out of the cell.

The correct option should be D, but seems there's a typing error, making option C & D identical. Option D should be "the electrochemical potential for K+ to move out of the cell." and it's the correct answer.

Reason :

The potential of the membrane in resting condition is quite closer to the equilibrium potential of Potassium ions, in comparison to that of Sodium ions. Therefore the permeability of resting membrane will be higher for K+ ions than for Na+ ions. Higher permeability for K+ ions means membrane will reach more closer to the equilibrium potential of potassium ions. Hence the membrane will selectively favour K+ ions to move out of the cell.

64) The correct option is D again, i.e. K+ leaks out of the cell.

Reason :

The internal concentration of K+ ions in the cell is quite higher than Na+ concentration. Electrolyte leakage usually occurs when the integrity of the cell membrane is compromised due to damage. The initial permeability of cell membrane for K+ ions is already quite high (as mentioned in previous question). Hence due to constant exchange of K+ and Na+ ions, K+ ions will keep leaking to the surroundings. Also, when the cell membrane is damaged, ion leakage may occur too. Due to high concentration of K+ ions inside the cell, they will rush out from the cell to the external surroundings. So in any case, the tendency of K+ ions to leak out from the cells will be quite high than other four options.

Please do leave a thumbs up and an upvote if this answer really helped you :-)