Question

what happens during the period labeled \2\ on this image? calcium exits the cell; sodium enters the cell through voltage gated sodium channels; t type calcium channels close

Explanation:

This graph appears to represent an action potential (common in biology, specifically neurobiology or cell physiology). During the period labeled "2" (the plateau phase in some action potentials, or the depolarization/maintained depolarization phase), voltage - gated sodium channels are open, allowing sodium to enter the cell. Calcium exiting the cell is not typical of this phase, and T - type calcium channels closing is not the main event here.

Answer:

Sodium enters the cell through voltage gated sodium channels