After the action potential passes through an axon, what restores the resting potential?
a. gated sodium channels open and allow sodium to flow into the cell.
b. gated sodium channels open and allow potassium ions to flow out.
c. gated potassium channels open and allow potassium ions to flow out.
d. gated potassium channels open and allow sodium to flow out of the cell.

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.