Question

Observe the sodium and potassium ions passing across the membrane during the simulation. You might want to slow down the simulation speed and use the zoom feature to get a closer view.

Which gated channels open first (during the upstroke)?

Which opens second (during the peak/downstroke)?

What direction are sodium ions moving through the sodium-gated channel? What direction is potassium moving?

Answer 1

Sodium ion channels open first, allowing sodium ions to move into the cell through sodium-gated channels, while potassium ion channels open second, allowing potassium ions to move out of the cell.

Step-by-step explanation:

The sodium ion channels open first during the peak/downstroke of the action potential, while the potassium ion channels open second.

Sodium ions move into the cell through the sodium-gated channels, and potassium ions move out of the cell through the potassium channels. The opening of sodium channels leads to depolarization, while the opening of potassium channels leads to repolarization.