Which of the following conditions would create this graph when a channel opens and the specific ion passes through? A) Cl^- concentration higher outside a cell B) Cl^- concentration higher inside a cell C) Na⁺ concentration higher inside a cell D) either Cl^- or Na⁺ concentrations higher inside a cell

Question

Quizplus · Accepted Answer

This graph shows an inward current, meaning that ions are moving into the cell. The opening of a channel for Cl- ions would result in an outward current due to the concentration gradient (higher concentration outside the cell), which is not shown in the graph. The opening of a channel for Na+ ions would result in an inward current, but the graph shows a slight delay before the current ramps up, suggesting a slow activation process that is not typically seen with Na+ channels. Therefore, the best choice is B, where the opening of a channel for an ion with a higher concentration inside the cell (such as K+ or Ca2+) would result in an inward current with a slow activation process.

Which of the Following Conditions Would Create This Graph When