What would the resting membrane potential be for this cell T

What would the resting membrane potential be for this cell?

To what would the membrane potential change if a drug was introduced that blocked the K+ leak channels?

To what would the membrane potential change from rest if a stimulus opened the Na+ ligand gated ion channels?

Which direction would Na+ move across the membrane if the membrane potential was 80 mV?

Which direction would K+ move across the membrane if the membrane potential was -80 mV?

Ton K+ Na [ECFI maM 143 LICF1 maM 138 Channel 800 1OO Ligand Gated Ion Channel 59O 48o

Solution

1. if Na+ ligand ion channel open, cl - in antiport system is observed

2.Direction would Na+ move across the membrane if the membrane potential was 80 mV :

At 80 mV , the Na+ ion concentration inside high so it pump to outside.

3.Direction would K + move across the membrane if the membrane potential was - 80 mV :

Negative sign refer to inside of the cell

At -80 mV, the Na + concentration is high outside of the cell. Intracellular Na + being pumped out to counteract any leaking back in.   The K+ concentration is high inside the cell from its passive diffusion to cancel the electrical potential