Question

2) At which of the membrane potentials would voltage-gated K+ channels have the lowest possibility of being open?

A. -60 mV

B. -30 mV

C. 0 mV

D. 30 mV

E. 60 mV

Answer 1

Voltage-gated potassium (K+) channels are membrane proteins that open and close in response to changes in membrane potential (voltage) across a cell membrane. These channels tend to open when the cell's membrane potential becomes more positive, allowing potassium ions to flow out of the cell and repolarize the membrane. Therefore, the voltage-gated K+ channels are least likely to be open at the resting membrane potential of a cell, which is typically around -70 to -80 millivolts (mV) in most excitable cells.

So, the voltage-gated K+ channels would have the lowest possibility of being open at the resting membrane potential (around -70 to -80 mV) of the cell.

Culled from AI