n normal neurons, K+ flows down concentration gradient out of cell, and Na+ flows down concentration gradient into cell.Group of answer choicesTrueFalse

The correct answer to the statement "In normal neurons, K+ flows down concentration gradient out of cell, and Na+ flows down concentration gradient into cell" is True.

Explanation:

1. Potassium ions (K+): In a typical neuron at rest, there is a higher concentration of K+ ions inside the cell compared to the outside. Therefore, K+ ions indeed flow out of the cell down their concentration gradient when the neuronal membrane is permeable.

2. Sodium ions (Na+): On the other hand, there is a higher concentration of Na+ ions outside the cell than inside. Consequently, Na+ ions flow into the cell down their concentration gradient, especially when sodium channels open.

Overall, these processes contribute to the generation and propagation of action potentials in neurons. Thus, the statement accurately describes the movement of K+ and Na+ ions in normal neurons.